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Leak in between master cylinder and brake booster

Leak in between master cylinder and brake booster

Postby GrumpyOldTruck [OP] » Aug 27 2013, 1:29am

I am leaking brake fluid in between my Master Cylinder and my Brake Booster on my 96 C1500.

So I just bought a new master cylinder as recommended by a mechanic. And Is there supposed to be a gasket in between the MC and the BB? because my new MC didn't come with one and I'm just wondering how it is going to seal if there isn't one?

Also could this leak be causing air to enter my brake lines? the brake pedal feels spongy
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Related Topics  05 Silverado- HELP Needed on New Master Cyl and Booster   Which master cylinder do i need   Master Cylinder   Master Cylinder For Sale   How to find out what master cylinder i need.   Sticking calipers or master cylinder?   Brake Booster   Hydroboost Brake Booster   Seafoam Through Brake Booster Line?   brake leak   Loud vacuum leak somewher by brake pedal/under dash   Sprint Booster   Master Blaster Dryer   Flow master time! 
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Re: Leak in between master cylinder and brake booster

Postby Canadian » Aug 27 2013, 2:09am

No gasket nesessary. the master cylinder is internaly sealed. Your're probably just low on brake fluid. My previous car used to leak in the same spot but as long as i kept topping it off it wouldn't go spongy.
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Re: Leak in between master cylinder and brake booster

Postby GrumpyOldTruck [OP] » Aug 27 2013, 2:15am

But its full?
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Re: Leak in between master cylinder and brake booster

Postby CaptainMorgan » Aug 27 2013, 3:02am

the rear seal in the master cylinder is leaking. replace it and its fine. The brake booster is just that, a booster. It assist in pressing the master, basically helps amplify the pedal input you give by pressing the brakes. Its fairly common for the rear seal to go out on them. My girlfriends nissan had it happen within the first year, some kinda of recall deal. But no, there is no need for a gasket b/t the two as the master cylinder is a sealed unit
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Re: Leak in between master cylinder and brake booster

Postby Canadian » Aug 27 2013, 3:03am

ok. well in that case ya it would be letting in air into the MC.
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Re: Leak in between master cylinder and brake booster

Postby GrumpyOldTruck [OP] » Aug 27 2013, 4:28am

Ok I get it now, thank yall so much for the help! :D
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Firing on 1 cylinder [L1]
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Extra Info: C1500 305 5.0L
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