Hey guys,

I just got the brake booster off my parts car at the ranch. I think the diaphram on mine is leeking so I am going to replace it tommorow. Funny thing, my friend took the master cylinder off while unbolted the booster from the inside of the firewall. So I did not see exactly how it went together... I think I can figure it out but want to know if I should empty the master cylinder of brake fluid before I go at it... Or any other tips...

Thanks

If you empty the MC you will have to bleed your brakes! So I would say no just replace the booster.

If you have access to a vacuum gun, you can test the booster without removing it from the car.

Lance

From your post I guess I can replace the brake booster without draining the master cylinder?

also Sblake

I dont have access to a vacum gun, but I have been told by a few It is a leaky diaphram, and highly suspect so myself.

yes that is correct

thanks alot!

(trying to get post # up...)

It works!!!!

The brakes are a 1000% better. They are almost too grabby now. I will tune them a bit. Thanks for all your help guys!

They always feel 'grabby' at first if youve been diriving with a bad booster and you replace it with a good one.

My brakes are mushy on the first pump, then firm on the second. Is that what yoour was like?

Otherwise, I probably have a leaky M.C.

thx

I have seen this said a few times, could possibly be your problem?

"IMPORTANT: When removing the brake booster, or installing a used one, it is critical that you do not pull out the engine-bay side pushrod of the brake booster. The so-called "reaction disc", which is a solid rubber disc about the diameter of a quarter, can fall off inside the booster. The result will very poor brake feel - you will have a deep spongy pedal and then all of the sudden you will get full braking and the car will stand on its nose."

yep,

pulled that out... It was suprisingly unattached also... I thought it might be broken it just slipped out so easy...

but I dotn know if the thing fell.. I only got to drive it for about 5 minutes before I had to entertain the girlfriend :cheeky:.

Anyway to fix it?

find the little sucker (probably still inside your booster!) and reassemble!