Brakes go s to floor - 1995 GMC Jimmy

You must have air in the brake lines. You will have to bleed the lines to get the air out. You will have to locate the bleed valve near each wheel. It is easier to take off the wheel so you can see everything. The brake line will have a drain screw near the place that the line goes into the brake caliper assembly. You will need a helper. Loosen the screw a bit then have your helper press the brake to the floor. Fluid and/or air will come out. While they hold it to the floor, tighten the screw so it won't such air back in when the brake peddle is released. With the brake pedal released, open the drain screw again and have the helper press the brake to the floor again. Repeat this until no more air comes out when the brake pedal is pressed. Then move to the next wheel and repeat. During the process make sure that the fluid in the master cylinder does not run out. The level will drop each time you bleed some of it from the bleed valve (or drain screw or whatever you want to call it). It helps to open the drain screw just enough to let a little fluid out. You won't waste as much that way. By time you get through with the last wheel the brake should not go to the floor anymore.

catastrophic failure , DO NOT DRIVE
so find leak, see leak location, that is BAD.
MC (master cylinder)
or slaves (calipers or drum cylinders.
or hoses. (any)
pipes, (aka, hard lines)
junctions.
aBS?

why not post source of leak, or better photos.
or better yet, call a mech. for help .

floor, floor of cab, floor of garage, just a tiny hint on floor
and what 4 corners of car. inside or outside.
,fluid can leak down both sides of any MC

pull your emergency brake up, Detach the park brake lever boot from the park brake lever,
Lift upward on the rear of the floor console finish panel to release the
floor console finish panel clips ,disconnect the electrical connector, Slide the park brake lever boot and the floor console finish panel over the park
brake lever, there you will be able to remove bulb by twisting socket,

check the vacume line to the braking master cylinder if this lose vacuum the peddle will go to the floor and have poor braking.

does it stay at floor if tou pump it?

For left hand drive vehicles: (If the car does not have ABS system you do not need any diagnostic equipment!)

IMPORTANT NOTE: You need using diagnostic equipment connected to the data link connector of the car in order to bleed the ABS block. Follow instructions by scantool equipment for bleeding the ABS block.

1. This bleeding procedure requires two people. Remove the brake system reservoir cap, and fill up with new brake fluid until "MAX" level is reached.
2. Lift the car, or use a channel for access under vehicle.
3. Put the gearbox in "N" - Neutral position, or in "P" - Parking position for automatic transmission.
4. Start the engine and push the brake pedal firmly for 4 - 5 times to the floor, and maintain the brake pedal pushed to the floor.
5. Begin with the rear right wheel. Another person remove the dust cap and loose the brake caliper bleeding screw until the brake pedal goes to the floor. At this moment maintain the brake pedal pushed to the floor, engine idling, and tight the brake caliper bleeding screw. Use a plastic hose: one end connected to the brake caliper bleeding screw, and another end inside a recovery bottle for used brake fluid.
6. Repeat steps no.#4 and no.#5 until no air flows through the brake caliper bleeding screw. Tight the brake caliper bleeding screw, and put the dust cap in their place.

IMPORTANT NOTE: All the time check the brake fluid level in the brake system reservoir, and fill up if necessary!

7. Push the brake pedal firmly for 4 - 5 times to the floor, and maintain the brake pedal pushed to the floor, engine idling.
8. Continue with the rear left wheel. Another person remove the dust cap and loose the brake caliper bleeding screw until the brake pedal goes to the floor. At this moment maintain the brake pedal pushed to the floor, engine idling, and tight the brake caliper bleeding screw. Use a plastic hose: one end connected to the brake caliper bleeding screw, and another end inside a recovery bottle for used brake fluid.
9. Repeat steps no.#7 and no.#8 until no air flows through the brake caliper bleeding screw. Tight the brake caliper bleeding screw, and put the dust cap in their place.

IMPORTANT NOTE: All the time check the brake fluid level in the brake system reservoir, and fill up if necessary!

10. Push the brake pedal firmly for 4 - 5 times to the floor, and maintain the brake pedal pushed to the floor, engine idling.
11. Continue with the front right wheel. Another person remove the dust cap and loose the brake caliper bleeding screw until the brake pedal goes to the floor. At this moment maintain the brake pedal pushed to the floor, engine idling, and tight the brake caliper bleeding screw. Use a plastic hose: one end connected to the brake caliper bleeding screw, and another end inside a recovery bottle for used brake fluid.
12. Repeat steps no.#10 and no.#11 until no air flows through the brake caliper bleeding screw. Tight the brake caliper bleeding screw, and put the dust cap in their place.

IMPORTANT NOTE: All the time check the brake fluid level in the brake system reservoir, and fill up if necessary!

13. Push the brake pedal firmly for 4 - 5 times to the floor, and maintain the brake pedal pushed to the floor, engine idling.
14. Continue with the front left wheel. Another person remove the dust cap and loose the brake caliper bleeding screw until the brake pedal goes to the floor. At this moment maintain the brake pedal pushed to the floor, engine idling, and tight the brake caliper bleeding screw. Use a plastic hose: one end connected to the brake caliper bleeding screw, and another end inside a recovery bottle for used brake fluid.
15. Repeat steps no.#13 and no.#14 until no air flows through the brake caliper bleeding screw. Tight the brake caliper bleeding screw, and put the dust cap in their place.
16. Now the brakes are bleeded. Check the brake fluid level in the reservoir. Fill up with new brake fluid until "MAX" level is reached. Put back the brake reservoir cap.
17. Test the car brake system. The brake pedal movement no more than 1/3 of total stroke until the floor, when brake pedal is applied. Maximum admissible is 1/2 of total stroke.

There is an adjuster under the console. See instructions below from autozone.com:

1. On vehicle with low series floor console:

1. If equipped, remove the manual transmission shift knob by turning counterclockwise.
2. Remove the floor console front finish panel.
3. Apply the parking brake, then remove the floor console rear finish panel.

1. On vehicle with high series floor console:

1. Apply the parking brake.
2. Remove the floor console finish panel.

1. Remove the adjustment nut clip.
   
2. Turn the parking brake control adjustment nut so that the parking brake control stroke is three to five notches when pulled.
   
   Fig. Turn the parking brake control adjustment nut so that the parking brake control stroke is three to five notches when pulled
   
3. Confirm the parking brake is applied.
4. Install the adjustment nut clip.

1. On vehicles with high series floor console:
2. 1. Install the floor console rear finish panel.

1. On vehicles with low series floor console:

1. Install the floor console rear finish panel.
2. Install the floor console front finish panel. If equipped, install the manual transmission shifter knob by turning clockwise.

Could be brake booster leaking. When engine is off the brake pedal should be firm and not go to the floor. If the pedal goes to the floor engine off, there may be a master cylinder problem also.

Change the brake caliper. This should do it.

Rate this

Parking Brake Cable Adjustment Vehicle with low series floor console

1. Remove the floor console front finish panel.
   1. If equipped, remove the manual transmission shift knob by turning counterclockwise.
   1. Remove the floor console front finish panel.

1. Remove the floor console rear finish panel.
   1. Apply the parking brake.
   1. Remove the floor console rear finish panel.

Vehicle with high series floor console

1. Remove the floor console finish panel.
   1. Apply the parking brake.
   1. Remove the floor console finish panel.

All vehicles

1. Remove the adjustment nut clip.

1. Turn the parking brake control adjustment nut so that the parking brake control stroke is three to five notches when pulled.

1. Confirm the parking brake is applied.

1. Install the adjustment nut clip.

Vehicle with high series floor console

1. Install the floor console rear finish panel.

Vehicle with low series floor console

1. Install the floor console rear finish panel.

1. Install the floor console front finish panel.
   • If equipped, install the manual transmission shifter knob by turning clockwise.