1995 suburban brake booster removal, how to disconnect from pedal under dash.

go under the dash and remove the split pin from the shaft and pull the shaft out of the brake pedal

disconnect the vacuum hose to the booster, then disconnect unbolt the master cylinder from the power booster(2 nuts) remove the cylinder from the booster by sliding it off the studs. inside the car under the dash disconnect the brake pedal from the booster rod and undo the booster mounting nuts/bolts there is 4 or them.

without undoing the brake lines undo the nuts that hold the master cylinder to the power booster and move it out of the way. then disconnect the vacuum hose to the booster then under the dash disconnect the brake pedal rod that connects the pedal to the booster then unbolt the 4 nuts that fasten the booster to the firewall. remove the booster.

There should be two or four mounting bolts accessed from under the dash. Usually the booster has studs and you remove the nuts.

here you go...

The power brake booster is a tandem vacuum suspended unit. Some models may be equipped with a single or dual function vacuum switch which activates a brake warning light should low booster vacuum be present. Under normal operation, vacuum is present on both sides of the diaphragms. When the brakes are applied, atmospheric air is admitted to one side of the diaphragms to provide power assistance.
REMOVAL & INSTALLATION

1994-97 Models
See Figures 1 and 2

1. Apply the parking brake and block the drive wheels.
2. Remove the master cylinder-to-power brake booster nuts, then reposition the master cylinder and combination valve out of the way; if necessary, support the master cylinder on a wire to prevent damaging the brake lines.

When removing the master cylinder from the power brake booster, it is not necessary to disconnect the hydraulic lines, therefore the brake system should not have to be bled.

1. Disconnect the vacuum hose from the power brake booster.

Fig. Fig 1: Common power brake booster attachment

1. From under the dash, remove the retainer and washer from the brake pedal on 1994 utility models. On all other models, remove the retainer and brake switch from the brake pedal.
2. Disconnect the pushrod from the brake pedal.
3. From under the dash, remove the power brake booster-to-cowl retaining nuts.
4. Back under the hood, remove the power brake booster and the gasket from the cowl.

To install:

1. Position the booster to the cowl using a new gasket.
2. Install the bo oster retaining nuts and tighten to 16 ft. lbs. (22 Nm) 1994 utility models, 24 ft. lbs. (32 Nm) on 1994 pick-up models and 27 ft. lbs. (36 Nm) on all 1995-97 models.
3. Connect the pedal pushrod and install the washer or switch and the retainer.
4. Connect the vacuum hose.

Fig. Fig. 2: Checking the piston booster rod using the gauge tool

1. For all vehicles cover ed in this guide, gauge the booster rod:
   1. Apply 25 in. Hg (85 kPa) of vacuum using a hand held vacuum pump or apply maximum engine vacuum.
   2. Chec k the maximum and minimum rod lengths using J-37839 or an equivalent pushrod height gauge.
   3. If the piston is not within limits, install a service adjustable piston rod and adjust it to the correct length.
2. Reposition the master cylinder and combination valve bracket to the booster studs, then secure using the retaining nuts. For details, please refer to the master cylinder procedure located earlier in this section.
3. Start and run the engine, then check for proper booster operation.

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Look underneath the dash and find the connection from the brake booster to the top of the brake pedal. Take off the clip that holds the pedal to the linkage with your hands. Unbolt the brake booster from the firewall with the 3/8-inch ratchet and socket.Unbolt the master cylinder from the booster with an open-end wrench. Pull the master cylinder off of the booster, then pull the vacuum line off of the brake booster. Take the booster away from the engine bay and discard it.Install the replacement booster onto the Suburban and bolt it in place with the 3/8-inch ratchet and socket. Reconnect the brake pedal to the brake booster with the factory clip.Mount the master cylinder on the booster with the open-end wrench and the factory bolts. Plug the vacuum line into the check valve on the replacement booster. Pump the brakes several times with your foot with the engine running to verify that the booster builds vacuum.
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under hood remove the master cylinder, do not disconnect brake lines just move it out of the way. than under the dash remove the four nuts just above the steering shaft. disconnect the push lever from brake pedal, then go under the hood and slide it out. reinstall in reverse order...

If it sounds like rushing air when you hit the brakes I would suspect the vacuum booster first. There is no air venting through the master cylinder but the booster is connected to a vacuum line. Kind of a pain in the *** to change, you have to remove the master cylinder, then get up underneath the dash and remove the bolts which go through the firewall and hold the booster. You may also have to disconnect the actuating rod which connects to the brake pedal arm. I would toss in a new master cylinder too when you put it back together. Do not put a used wear item in your vehicle unless you want to do the job again soon.

from autozone.com:

1. Disconnect the negative battery cable.
2. Apply the parking brake.
3. Unplug all necessary electrical connections.
4. Remove the master cylinder from the booster and pull it off the studs, CAREFULLY! It is not necessary to disconnect the brake lines.
5. Disconnect the vacuum hose from the check valve.
6. If necessary, remove the brake light switch.
7. Disconnect the booster pushrod at the brake pedal.
8. Remove the booster mounting nuts, located on the inside of the firewall.

Fig. Fig. 1: Vacuum booster mounting

1. Lift off the booster and remove the gasket.

To install:

1. Install the booster with a new gasket.
2. Tighten the booster mounting nuts to 21 ft. lbs. (29 Nm) on all except 1996-98 models. On 1996-98 models, tighten the nuts to 26 ft. lbs. (36 Nm).
3. Install all remaining components.

Press brake pedal several time to exhaust pressure from accumulator, Clean dirt from hydrulic line connections at booster and at master cylinder.Disconnect hydraulic lines from booster and plug all openings. Note; in most cases it is not necessary to disconnet master cylinder brake lines to remove booster.Remove and support master cylinder.Disconnect booster push road from brake pedal. remove booster to firewall nuts from inside vehicle.Remove booster and gasket