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GMC Forum: 1999 GMC Sonoma Master Brake Cylinder Leak
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Old 07-19-2017, 11:59 AM
thepocketsavior thepocketsavior is offline
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Drives a GMC Truck
Join Date: Jul 2017
Posts: 1
Default 1999 GMC Sonoma Master Brake Cylinder Leak

I'm having an issue with a leak between the master cylinder and the brake booster.
I replaced the master cylinder and now it leaks, the old one did not.
It only leaks when the brake pedal is depressed.
Is the some gasket or something that might have gone bad?

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Old 07-21-2017, 10:47 AM
OnlySonoma's Avatar
OnlySonoma OnlySonoma is offline
Drives a 1995 GMC Sonoma SLS Extended Cab 4.3L V6 TBI RWD
Join Date: Aug 2016
Location: BC CANADA
Posts: 66

There is most definitely a master cylinder to break booster gasket.
If it leaks from right between the 2 parts, then this is your problem.
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