Ok the plastic unit was cracked and no good. Upgraded to the metal unit from zip corvette. $159 plush shipping was the price.

cracked leaky booster

took me 1 hour to finish.

tips: remove driver seat and support bar infront of brake mc

tools needed:
1, 2 or 3 extensions
ratchet, swivel(optional), 1/2 inch deep socket, 13 mm deep socket
zr1 metal brake booster(came with new 13mm nuts for front and back of booster
optional 8mm high temp silicone hose for booster check valve to upper plenum



disconnect battery of course
take out drivers seat of course

take 6 bolts off of support bar in front of brake master cylinder.


3 screws on cruise unit come out so you can access 2 of the 3 bolts on upper side of support bar.


take off 2 bolts on brake mc and push forward


take panel near pedals off(unscrewed them by hand)
take off 2 1/2 inch nuts under dash. Accelerator pedal is easy. Steering column side requires 2 extensions and 1/2 deep socket. Disconnect pin holding pedal to rod(mine was already gone).


pull booster out install new one.


reinstall in reverse order.
Luckily my large hands or 2 fingers were long enough to get the column side nut started.

Mods please cleanup any way you wish. I am not very good at write-ups but I wanted to try and give back alittle. Thanks.

Great job! Doing this job in an hour is fast. I've done it before and although it's not a difficult job mechanically, the cramped working space makes it very tough. So I commend you on your work

Matthew

Looks great!

I agree with Matthew! VERY FAST! But, I think removing the seat saved you time. I have come to the conclusion that it is faster to peal back the layers on these cars than try to work through them.

Excellent job!!!

thank you. Yes really wasn't bad. The booster on my 90 300zx was alot harder. It has 4 bolts on the back end. I am 6ft 3 238 so removing the seat was a must no matter what. Still sucked trying to lay down in there. I put my legs in the hatch area for room while laying on my back.

Quote:

Agree, I'm a big guy... so removing the seats can often help with under the dash work.. sometimes you have to lay upside down on your back to do the job...

ok so I actually drove it today. Wow!! I can stop!!! Lol. I think the booster has been bad since I have had the car. It did sit for 12 years before I got it.

Stopping is good!

I'm with Rick, I am a big guy too, 6' 300 or more... and taking out the seats to do dash work is about essential.

I also am not afraid to remove inner fenders and things like that.

Great job and pics!!