Question about 2002 Oldsmobile Alero

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Anyone have a Brake line schematic

I would like a diagram of the ABS valve, and where each line on the ABS unit runs to, or what wheel it feeds. I might use a somewhat different routing if I can. Brake line schematics and routing from the proportioning valve to the calipers Thank You.

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
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Posted on Jan 02, 2017

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Anonymous

  • 625 Answers

SOURCE: Vacume diagram / schematics for carbureter

you can get the schematic at autozone.com
online only

Posted on Jun 30, 2008

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Anonymous

  • 107 Answers

SOURCE: Right front brake drags

Replace the flex line the rubber line between the car and the caliper. The inside of flex line can collapse making the back flow to release the caliper extremely slow. You can confirm the line is the problem by doing two tests. Pump the brakes up and undo the line at the caliper and it should release the caliper. Pump them up again and then undo the flex line at the steel line going to the master cylinder this should not change anything. Let me know if your findings are different and we can go from there. Mike

Posted on Jan 05, 2009

Anonymous

  • 108 Answers

SOURCE: 92 dodge van rear ABS-brake and ABS lights on/can't reset?

Its probably how your bleeding your brakes, but first make sure the bleeding nipples are facing upward. You should bleed diagonaly, front pass wheel then rear driver wheel. Then front driver wheel and rear pass wheel. The abs light has its own computer your have to get it scanned to clear the codes and turn off the light

Posted on Mar 18, 2009

Jonah Oneal

  • 14092 Answers

SOURCE: The front left brake is doing all the braking and

ABS LIGHT ON COULD BE A BAD WHEEL SENSOR CAUSING ABS UNIT LOCK UP THAT WHEEL OVERHEATING OR YOU COULD HAVE FAULT IN THE ABS UNIT.TAKE VECHICLE TO GARAGE OR DEALERSHIP.LET THEM SCAN THE ABS BRAKE SYSTEM TO SEE WHATS CAUSING ABS LIGHT TO COME ON.

Posted on Sep 24, 2010

jturcotte

Jeffrey Turcotte

  • 8984 Answers

SOURCE: I did a brake job complete new calipers and wheel

Hi, it's possible you affected the operation of the wheel speed sensors when doing the brake work.

Please see my tip at http://www.fixya.com/cars/r6003525-abs_traction_control_lights . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Mar 10, 2011

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1 Answer

99 caravan 3.3 no abs brakes. I have replaced a bad master cylinder and all 4 rusted brake lines. The ABS brake warning light is not on. The van does not pull to one side.


Something is wrong with your statement
it is a 99 caravan 3.3 no abs , then you are on about abs light pump etc
the abs pump only works when the master cylinder is under pressure and that pressure is suddenly reduced by the sensor reading a locked wheel and a valve is opened to release line pressure to that wheel As soon as that wheel starts to turn, the valve closes
while the wheel is stopped and that valve is open , the abs pump kicks in to maintain line pressure otherwise the brake pedal would go to the floor
master cylinders work through a. abs unit and not because of it so if the master cylinder becomes faulty, the abs pump will not operate until a wheel stops turning as there is no line pressure to stop a wheel turning
the abs light may not be on because there is nothing to operate the system to put it on

Apr 30, 2016 | Cars & Trucks

2 Answers

I have 1996 Ford e-350 dual rear wheels with 4 wheel ABS system and spongy brake pedal ( goes to floor) before slowing down. I have put on 1 NAPA and 2 Advance Master Cyls. and a new brake booster, Bled...


Easiest way to check the master cyl. is to remove the lines and thread in plugs to block the ports. Then step on the pedal and if its hard and not fading you know the master is ok. If the rear brake shoes are wore out or not adjusted correctly you will have a low/spongy pedal
I have seen the RWAL valve cause this problem several times. You can still buy them through aftermarket parts suppliers since Ford discontinued it.
Also have a assistant check the firewall for flexing when the pedal is applied. It is not uncommon for the firewall to crack where the booster mounts and then the firewall flexes.
I also remember having to change the master cylinder to one with a larger bore to correct the problem you are describing. I believe there is a service bulletin on that with part #'s

Nov 04, 2013 | Cars & Trucks

1 Answer

Which brake line goes to which which wheel from the master cylinder?


Not familiar with this model, but most cars have only one output and one return line to/from the master cylinder. The output line usually goes to a proportioner valve downstream from the master cylinder. This valve applies more pressure sooner to the rear wheels, then to the front. This prevents "fishtailing" when braking hard. If you follow the forward-most line away from the master cylinder, you'll probably encounter a block where this line feeds in and two or four lines feed out. That's the proportioner valve.

Sep 27, 2013 | 1998 Dodge Stratus

1 Answer

1997 honda brake system


its called the abs moduel and system

Dec 16, 2012 | 1997 Honda Accord

1 Answer

Looking for a replacement part for My 1999 Ford F150 XL 4.6 L... With no luck. (I had a faulty front brake line - now after replacing it ..it will not bleed air or fluid) Disconnected the line from the...


YOU NEED A SCAN TOOL TO BLEED BRAKES.THE SCAN TOOL REACTIVATE HYDRALIC BRAKE MOTOR.YOU CAN RAISE VECHICLE WHEELS OFF GROUND SUPPORT SECURE SAFELY. ALLOW DRIVE WHEEL SPIN 5 MILES AN HOUR WHILE VECHICLE OFF GROUND THE WHEEL SENSORS WHILE WHEELS SPINNING WILL ACTIVATE ABS HYDRALIC MOTOR TO BUILD UP BRAKE FLUID PRESSURE.THEN LOWER VECHICLE TO GROUND.MAKE SURE MASTER CYLINDER BRAKE FLUID LEVEL CORRECT THEN BLEED BRAKES IF BRAKE DONT FEEL FIRM OR SOLID DONT DRIVE HAVE VECHICLE TOWED IN.GARAGE WILL HAVE TO USE SCANNER TO BLEED BRAKES.

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ATI LOCK LIGHT ON BRAKES WORKING BUT DONT FEEL THE SAME AS NORMAL


Check Brake fluid level.

When the ABS light is on, the brakes should revert to standard braking.

The only time ABS should invoke is when the tires are slipping as sensed by the wheel speed sensors when the wheel locks up on any of the axles.
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ANTI-LOCK BRAKE SYSTEMS General Information Fig. 1: RWAL brake system diagram
Fig. 2:4WAL Component locations — except 1996 models
p>Fig. 3: 4WAL Component locations — 1996 models Fig. 4: Three sensor 4WAL brake system diagram — Except 1996 models
Fig. 5: Four sensor 4WAL brake system diagram — Except 1996 models
There are two basic types of anti-lock systems available for this vehicle; a Rear Wheel Anti-Lock (RWAL) brake system and 4 Wheel Anti-Lock (4WAL) brake system. The 4WAL system has two variations; a 3 sensor system and a 4 sensor system. The 2WD vehicles will be equipped with the 3 sensor system, but the AWD vehicles can be equipped with either. The systems are easily identified by looking at the rear wheels for a sensor harness. If there is a sensor harness and thus, rear wheel sensors, it is the 4 sensor system. If the vehicle is not equipped with a harness, it is the 3 sensor system. The 4 sensor system takes it speed references from each of the wheels. The 3 sensor system takes its speed references from each of the front wheels and the vehicle speed sensor located in the transmission (2WD) or the transfer case (AWD). The RWAL system components consist of the Vehicle Speed Sensor (VSS), the Electronic Control Unit (ECU), the isolation/dump valve and the Vehicle Speed Sensor Buffer (also known as the Digital Ratio Adapter). The ECU also receives signals from various brake switches. The 4WAL system components consist of the Electro-Hydraulic Control Unit (ECHU) valve (also known as the Brake Pressure Modulator Valve or BPMV), the wheel speed sensors, Vehicle Speed Sensor (VSS) on 3 sensor systems and the VSS Buffer. prev.gif next.gif

Sep 01, 2010 | 1993 Chevrolet Astro

1 Answer

ABS light stays on sounds like a abs pump is staying on. Is there a pump for the abs system?


There is no seperate pump. The following lines will give you more details

Braking force and the tendency of the wheels to lock up are affected by a combination of factors such as the friction coefficient of the road surface, and the difference between the vehicle speed and the road wheel speed. The ABS prevents the road wheels from locking up during heavy braking by controlling the vehicle's brake system hydraulic pressure.
During normal braking, as the rotational speed of the wheel falls, no electric current flows from the ECU to the hydraulic unit. The solenoid valve is not energized. The brake master cylinder hydraulic pressure is applied to the brake unit, and the ABS is not involved. However, even though the ABS is passive during normal braking, its control module is constantly monitoring for rapid deceleration of any of the wheels.
If a wheel-speed sensor signals severe wheel deceleration - which means the wheel is likely to lock up - the ECU sends a current to the hydraulic unit. This energizes the solenoid valve. The action of the valve isolates the brake circuit from the master cylinder. This stops the braking pressure at that wheel from rising, and keeps it constant.
If the sensors signal the wheel is still decelerating too rapidly, the ECU sends a larger current to the hydraulic unit. The armature moves even further and opens the valve. It opens a passage from the brake circuit. Brake fluid is sent from the brake circuit back to the master cylinder. Pressure in the brake caliper circuit is reduced so that the wheel is braked less heavily.
If the wheel sensors indicate that lowering the brake pressure is letting the wheel accelerate again, the ECU stops sending current to the hydraulic unit and de-energizes the solenoid valve. This lets the pressure increase, so that the wheel is again decelerated.
This cycle repeats itself about four to six times per second.
It is normal in an ABS for the valves in the hydraulic control unit to keep changing position as they change the brake pressure that’s being applied. These changes in position may cause rapid pulsations to be felt through the brake pedal.

Jun 06, 2010 | 2003 Chevrolet Silverado 1500

2 Answers

Leaking brake fluid from rear driver side brake lines,need a diagram of how to replace the lines. 1994 ford taurus 3.o v6.thanks


They don't make diagrams for brake lines. The lines are sold in bulk. You need to measure and duplicate the bends in the orignal lines and cut/flare the lines yourself. You will need a tubing cutter, flare tool and tubing bender.

Feb 27, 2010 | 1994 Ford Taurus

1 Answer

ABS brake module sounds like a motor running and won't stop unless battery is disconnected. what is fix?


I would pull the fuse for the ABS hydraulic pump and then put it back in and see what happens. Don't ever recall a pump running. Dealer may need to hook up scan tool for diagnostic fault codes, DTCs.



Principles of Operation
The ABS control module receives wheel speed readings from both front wheel speed sensors and the rear differential speed sensor, and processes this information to determine if an ABS event is necessary. The wheel speed sensor electrically senses each tooth of the ABS sensor indicators as it passes through the wheel speed sensor's magnetic field.
The ABS control module continuously monitors and compares the rotational speed of each wheel speed sensor indicator and, when it detects an impending wheel lock, modulates brake pressure to the appropriate brake caliper(s). This is accomplished by triggering the hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the ABS control module returns the solenoid valves to their normal position, and normal (base) braking resumes.
The ABS control module is self-monitoring. When the ignition switch is turned to the RUN position, the ABS control module will do a preliminary electrical check, and at approximately 20 km/h (12 mph), the pump motor is turned on for approximately one-half second. Any malfunction of the ABS system will cause the ABS to shut off; normal power assisted braking, however, remains.
Inspection and Verification — Scan Tool Communications Check
  1. Verify the customer concern by carrying out the Drive Cycle Test.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Parking brake cable
  • Tire pressure
  • Tire size or mismatched tires
  • Blown fuse
  • Central junction box (CJB):
    • fuse 23 (10A)
  • Battery junction box
    • fuse 102 (50A)
  • Connectors or connections
  • Ground integrity
  • Harness routing
  • Wire chafing
  • Circuitry open/shorted

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Anti-Lock Control The four-wheel anti-lock brake system (4WABS) consists of the following components:
  • Anti-lock brake control module (2C265)
  • Front anti-lock brake sensor (2C204)
  • Front anti-lock brake sensor indicator (2C182)
  • Hydraulic control unit (2C219)
  • Rear anti-lock brake sensor (2C190)
  • Rear anti-lock brake sensor indicator (2C189)
  • Yellow ABS warning indicator

May 07, 2009 | 2000 Ford Expedition

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