A question about brake boosters.
Thread Starter
Race Director
Joined: Dec 2003
Posts: 14,138
Likes: 935
From: Fremont Ca
2022 C4 of the Year Finalist - Modified
A question about brake boosters.
When a booster fails most of the time what goes out,the rubber diaphragms?The booster for my 91 ZR-1 is getting harder to find and when you do find one at $400 a pop,a little steep.I can still get OEM rebuild parts,would this be the way to go as long as I can get the soft parts for a rebuild?
Race Director
Joined: Dec 2006
Posts: 10,383
Likes: 4
Diaphragms and check valves finally a crack in the body on the plastic ones.
FWIW brake fluid will eat the soft bits.
I would certainly consider a rebuild or a switch to the metal ones. (that is if the ZR1 doesn't already have a metal one)
FWIW brake fluid will eat the soft bits.
I would certainly consider a rebuild or a switch to the metal ones. (that is if the ZR1 doesn't already have a metal one)
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
This is just a suggestion for the future..Excessive heat is what kills the plastic boosters most of the time, either causing them to crack or frying the insides ...To stop plastic brake boosters from cracking and failing, buy some of the adhesive thermal tape and put a couple layers on the side of the booster facing the exhaust manifold or headers..I was having a problem with my plastic booster getting real hot when I installed headers and this thermal tape now keeps the side of the booster from getting hot..It went form so hot I couldn't touch it, to cool enough I can keep my hand on it . Try this thermal tape, it really works...
..WW
..WW
Last edited by WW7; May 6, 2012 at 08:59 AM.
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
I would get a new "plastic" OEM one and put it on the shelf for when you want the ZR1 "correct" and buy a steel version.
As others have noted...the plastic housing and the underhood temps don't get along too well.
After that is the diaphragms/check valves going out.
The metal booster is MUCH more durable...
As others have noted...the plastic housing and the underhood temps don't get along too well.
After that is the diaphragms/check valves going out.
The metal booster is MUCH more durable...
