brake booster

[Tourniqet]

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

[LanceM]

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

[sblake01]

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

[Tourniqet]

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.

[LanceM]

yes that is correct

[Tourniqet]

thanks alot!

(trying to get post # up...)

[Tourniqet]

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!

[sblake01]

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

[TomoHawk]

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

[Bruce Woolmore]

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."

[Tourniqet]

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?

[Bruce Woolmore]

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