View Full Version : Brake Failure

05-27-2005, 09:48 AM
I just drove my '76 TR6 to the store and when I hit ther brakes the first time (other than pulling out of the driveway) the pedal went to the floor. After another push or two they were fine again. I did a brake rebuild about a month ago and they have been fine. Anything quickly come to mind before I start a diagnostic session?

05-27-2005, 10:33 AM
Only thing that comes to mind is the brake servo. I had a similar problem with my 70 and it turned out to be a servo failing internally. It can get to the point where brake fluid will actually leak inside the car onto the pedal box and make a huge mess. I'd take a look and see if you can see any leakage.Either that or the one way brake servo check valve that attaches to the vaccuum hose. Good luck,


05-27-2005, 10:56 AM
Sounds like a Master Cylinder problem, did you rebuild that when you did the brake rebuild?

05-27-2005, 11:43 AM
Thanks for the posts, I'll check your ideas. No, the only thing I didn't rebuild was the master.

05-27-2005, 01:21 PM
Are you actually losing fluid?

If you pump the brakes up and then press firmly on the pedal does it hold? Or does is move slowly toward the floor?


05-27-2005, 01:39 PM
You might try a brake bleed before you do anything that costs a bunch of money, especially if you get brakes back if you pump them. May have just gotten an air bubble in a line somewhere.

Trevor Triumph
05-27-2005, 01:57 PM
I had an expereience several years ago after I had repaired the master cylinder. When easing the brakes the pedal went to the floor. When pushing the brake pedal quickly the response was normal. I think I must have put the worn washer back on! When going easy, the fluid could work around the washer. When pushed quickly the fluid couldn't leak around so I had brakes. The first time it happened was scary. At least I got home without incident. T.T.