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Replacing Power Brake Booster (1988)

 
Old 02-04-2009, 05:37 PM
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88Z51
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Default Replacing Power Brake Booster (1988)

It looks like I need to replace the power booster on my '88 (pedal is hard as a rock - doesn't seem to have any power assist). Any tips on how to remove the two nuts located on the firewall (inside the car) that attach the booster to the firewall?
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Old 02-04-2009, 06:33 PM
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The "detailed" disassembly instructions in my FSM state "remove:
1. Nuts attaching MC to the rods.
2. MC.
3. Vac hose from vac check valve.
4. Pushrod end of valve assy. from brake pedal.
5. Nuts from the rods.
6. Power Head assy. from cowl.

Can't you get a wrench onto those nuts?
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Old 02-04-2009, 06:48 PM
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Originally Posted by 65Z01 View Post
The "detailed" disassembly instructions in my FSM state "remove:
1. Nuts attaching MC to the rods.
2. MC.
3. Vac hose from vac check valve.
4. Pushrod end of valve assy. from brake pedal.
5. Nuts from the rods.
6. Power Head assy. from cowl.

Can't you get a wrench onto those nuts?
Thanks, after reading those same "detailed" instructions in my FSM, I thought "easy enough, how difficult could it be?" Then I crawled under there. Holy crap! I think I may need to purchase a 13mm wobbly socket as the steering column and a metal bracket all but obstruct access to one of the nuts. And while not as bad, the other doesn't exactly appear easy to access either.
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Old 02-04-2009, 06:49 PM
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CorvetteMike2004
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Default booster

Isnt there 4 bolts inside? Anyway, take the seat out, use lots of swivels and extensions, and a good flashlight. Its do able. You may need a helper to hold the unit in place when you put it on. Good luck, A project you wont forget about for a while. I still have memories of that project 5 years ago.

Corvette Mike

Last edited by CorvetteMike2004; 02-04-2009 at 07:58 PM.
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Old 02-04-2009, 07:29 PM
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Originally Posted by CorvetteMike2004 View Post
Isnt there 4 bolts inside? Anyway, take the seat out, use lots of swivels and extensions, and a good flashlight. Its do able. You may need a helper to hold the unit in place when you put it on. Good luck, A project you forget about for a while. I still have memories of that project 5 years ago.

Corvette Mike
Thanks. While it was a pain, I was able to remove the nuts and then the booster from the firewall. While other years may use four nuts, thankfully, this only has two. I think the real fun will be tomorrow when the new booster arrives - I suspect getting those nuts started on the studs is going to be a serious test of my patience
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Old 02-04-2009, 08:01 PM
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Default booster

Have you experienced the "heater core replacement" job yet? That one will leave you with memories also.

Corvette Mike
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Old 02-04-2009, 08:34 PM
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Originally Posted by CorvetteMike2004 View Post
Have you experienced the "heater core replacement" job yet? That one will leave you with memories also.

Corvette Mike
While replacing a heater core is quite possibly the worst job to do on most any car, I've heard it's an absolute nightmare on a C4. Something to look forward to......
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Old 02-04-2009, 10:43 PM
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Originally Posted by CorvetteMike2004 View Post
Isnt there 4 bolts inside? Anyway, take the seat out, use lots of swivels and extensions, and a good flashlight. Its do able. You may need a helper to hold the unit in place when you put it on. Good luck, A project you wont forget about for a while. I still have memories of that project 5 years ago.

Corvette Mike
1/4" swivels and extensions. Been about 3 years since I've done a booster, and my back still hurts. I remember thinking "Sh*T, if I get that 13mm nut off, how the hell will I ever get it back on?"

Well, it took me like an hour to get that nut threaded by using :
lots of swivels and extensions

I should have taken the time to remove the seat......but nooooooooo, I didn't want to be a girly-man.....

When you get the job done, pay yourself $500, you'll feel like you earned it !!

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Old 02-05-2009, 07:54 AM
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Its do-able but not an easy fix. Been there, done that. Use a socket with two swivels and one extension. Level of pain/difficulty----its a cross between a root canal and a vasectomy.
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Old 02-05-2009, 01:04 PM
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Originally Posted by runner140* View Post
Its do-able but not an easy fix. Been there, done that. Use a socket with two swivels and one extension. Level of pain/difficulty----its a cross between a root canal and a vasectomy.
I found it easier to pass a kidney stone than replacing a booster. ....it would be nice if the booster mfg. would also supply 40cc of demoral...at least this way you could contort your body every which way but loose and not feel a thing !!!

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Old 02-05-2009, 09:18 PM
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Originally Posted by joecarter85 View Post
I should have taken the time to remove the seat......but nooooooooo, I didn't want to be a girly-man.....
I was able to do the job without removing the seat - while I don't think that qualifies me as a girly man, but sometimes being of smaller stature has its advantages.

Originally Posted by runner140* View Post
Its do-able but not an easy fix. Been there, done that. Use a socket with two swivels and one extension. Level of pain/difficulty----its a cross between a root canal and a vasectomy.
Putting the two nuts on the studs wasn't as much of a test of patience as I thought it would be. The pin that connects the booster to the pedal seemed to be the biggest pain - I'd rate its degree of pain/difficulty somewhere near a sprained finger.


Originally Posted by joecarter85 View Post
I found it easier to pass a kidney stone than replacing a booster. ....it would be nice if the booster mfg. would also supply 40cc of demoral...at least this way you could contort your body every which way but loose and not feel a thing !!!

I'm enjoying a muscle relaxing ice cold beer right now. Although by morning, I may well be wishing for those 40cc's!


BTW, there was a 4" crack in the housing of the old booster. I'm not sure what would cause that to suddenly happen, but whatever the reason, I'm happy to have brakes again! Now all I need is nice weather so I can play.
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Old 02-06-2009, 12:14 AM
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Congrats !!! You are mans man!!

I totally forgot about that SOB clip on the brake connector rod that you have to remove blindly!! Man, I am re-living the horror through your thread......

Did you enjoy that one nut on the right side of the pedal ?? You know, the one that you can only see with one eye and barely get a socket on it.....

Anyway, glad you got her all fixed up....way to go !!!!!!


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Old 02-06-2009, 05:56 AM
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Oh yeah, brings back all those memories of these two ****'s at my previous '87... (one is visible, while the other is hiding)



Ergonomic working position

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Old 02-06-2009, 12:58 PM
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Originally Posted by Yorcci View Post
Oh yeah, brings back all those memories of these two ****'s at my previous '87... (one is visible, while the other is hiding)


Now throw a clutch pedal into the mix and it's even more fun!
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Old 02-08-2009, 02:48 PM
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Originally Posted by 88Z51 View Post
Now throw a clutch pedal into the mix and it's even more fun!
Outch! Didn't even cross my mind, because that '87 was automatic. Hope, that I won't have to do it all again with the present manual...
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Old 07-14-2018, 01:25 PM
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Check the bolts on the replacement booster. The original had SAE threads on the Delco replacement it had Metric threads so nuts would not work. I am glad I checked this beforehand.
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Old 07-17-2018, 09:55 AM
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Originally Posted by carsvettecarsvette View Post
Check the bolts on the replacement booster. The original had SAE threads on the Delco replacement it had Metric threads so nuts would not work. I am glad I checked this beforehand.
You realize this is a 9 yr old thread. Still good info but definitely dated. If you want to add to it, on starting the nuts issue: use hot melt glue and stick them into the socket to get them aligned. They won't fall out on you and it will definitely help keep a little sanity around.

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