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Triumph TR6 - brake travel

The travel on my brakes (pedel to floor) is very low the brakes work good and "pumping" them does not change anything. My inspection guy questions wether that is normal. Is the a way to change this and how does others work Thanks Dave
dgf Finch

How worn are your rear shoes?
Chris Wiebe

i thought about that they look good and i adjusted them to real close to the drums , not much of a difference thanks for the thoughts dave
dgf Finch

Check the pedal bushings, clevis pin, and push rod for wear and or elongated holes. A lot of slop occurs at this point.
Andy Blackley

Also check the master cylinder. An internal leak would be manifested by a pedal that goes to the floor somewhat slowly as you apply pressure. However pumping can recover some brake function if the seals are not too far gone. Usually occurs on a hill, stopped for a traffic light and in long line of traffic behind you! BTDT.
Another thought: have you recently swithced to silicone brake fluid?
Andy Blackley

i rebuilt most of the brake system during the car rebuild, master cylinder wheel cylinders new and new lines did use silicone fluid why do you ask going to rebuild the servo tonight but don't really expect much will check slop and pin the pedel starts to provide brakes about 3 inches from floor does not fade and does stop car thanks for the help dave
dgf Finch

The condition of the servo shouldn't effect the pedal travel; just the ease of the travel. I suspected air in the lines, but since you said that pumping didn't improve things and that the pedal didn't continue to slowly travel when depressed (a leak), it sounds like too much slop in the linkage/rod.

BB
Brent B

dgf Finch: My comment about the pedal sinking slowly applies to a possible leak internally past seals of the master cylinder.
The change to silicone, while a good thing, also creates a potential headache in that silicone traps micro air bubbles that join together to form larger air bubbles in the lines, making it difficult to bleed. The air in the lines results in long pedal travel.
Several bleeds may be necessary to eliminate it. Silicone, after itis purchased or received through mail order, should be allowed to stand undisturbed in the bottle for a time (several days) to allow air to escape to the top, and it should be poured into the reservoir ever so slowly to avoid creating more air bubbles. During bleeding the pedal should be worked by slow, even pumping. Slow and easy is the key.
The archives have some good threads on the topic. I like to use the blleding method described in the Haynes manual: attach a length of clear tube to the bleed screw with the other end in a jar partially filled with fluid. During the bleeding you will see the obvious air bubbles. The micro bubbles are harder to see (when I did mine I saw a stream of whitish fluid which looked to be entrained air) so a repetition of the bleeding over a period of several days may be needed to get them all.
Andy Blackley

This thread was discussed between 01/06/2005 and 02/06/2005

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