power brake problem
Thread Starter
Instructor
Joined: Aug 2003
Posts: 216
Likes: 0
From: west coast fl
power brake problem
My 65 has the 67 power brake booster and reservoir. It has developed a leak where the reservoir and booster connect. Its only about two years old. First I'm not brake savvy and was wondering if it might be a gasket leak there or is it more serious.
Burning Brakes
Joined: May 2003
Posts: 990
Likes: 4
From: DAVIE/FORT LAUDERDALE FL
Not a gasket. The master cylinder has developed an internal leak and that is where the fluid is exiting-it will ruin your booster if not repaired. Change the master cylinder or if it is original, have it rebuilt.
Race Director
Joined: Jun 2006
Posts: 17,901
Likes: 751
From: Inverness FL
St. Jude Donor '07
chances are the mastercylinder is leaking out the back. pull the master cylinder off the front of the power brake unit and check the inside of the back of the MC. if you see brake fluid then it must be rebuilt or replaced. rebuilding is easy if you have a wheel cylinder hone (providing there is no significant pitting of the bore); and the rebuild kit, or a rebuilt MC, is available from your local auto parts store.
Bill
Bill
Thread Starter
Instructor
Joined: Aug 2003
Posts: 216
Likes: 0
From: west coast fl
Thanks for all the replies. I've never pulled a master cyl. before is it straight forward or is there more I need to know. Also is there any detail on the Internet for doing it. Thanks.
Le Mans Master
Joined: Aug 2005
Posts: 6,539
Likes: 1,970
From: Temple Terrace Florida
Mc
Taking the unit off the car is straight forward. Cover the fender. The fluid will eat into your paint very quickly if you spill any on the car finish. I spray Liquid Wrench on the brake line fittings and remove carefully. There is a special wrench available for flair fittings. It makes stripping the fittings less likely. Remove the two bolts from the booster and remove the M/C. Upon installation, bench bleed the M/C. There is an inexpensive kit available which consists of plastic fittings and rubber hoses. Follow the instructions. I set the M/C in a vice fill it up with clean fluid and insert a phillips screwdriver and with the hoses feeding back into the reservoir, pump the M/C. I use clothes pins to hold the hoses in the reservoir. Pump the screwdriver until all air bubbles disappear. Reinstall the M/C on the booster and reconnect the brake lines. Lastly, bleed the brakes at the wheels. Bleed RR, LR, RF and lastly LF. I also hit the brake caliper with a rubber hammer to dislodge any air bubbles. You should have a firm brake petal. Good Luck. Jerry
