I have a '70 Challenger with power disc brakes. I have a problem with a hard pedal (It only travels about 1" and then "bottoms out". They do not produce enough force to stop the car. I have had 2 mechanics work on it with little luck. The booster and master cylinder are good, no air in the system. Any suggestions?
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19970 Dodge Challenger Hard Brake Pedal?
- Thread starter David
- Start date
You say the booster is ok but you may need to double check it....The booster diaphram may be leaking/bad or not getting enough vacuum to assist the brakes. Check to make sure the vacuum hose to the booster is connected to the correct manifold or carb tap for vacuum and that the check valve in it is ok. It could also be that the pedal pushrod to the booster needs to be adjusted...not sure why if you didn't fiddle with it. Some high performance engines with extreme cam profiles do not make enough vacuum at low speeds/idle to operate the booster...if that is the case, you need to add another vacuum tank to the system or a vacuum pump like some diesels have or a hydro-assisted brake booster which some diesels also use....that can get expensive with all the additional p/s pump and lines and booster. You could run a piece of the correct size hose from your booster to another test car with known good vacuum to see it it's a vacuum issue.
You say the booster is ok but you may need to double check it....The booster diaphram may be leaking/bad or not getting enough vacuum to assist the brakes. Check to make sure the vacuum hose to the booster is connected to the correct manifold or carb tap for vacuum and that the check valve in it is ok. It could also be that the pedal pushrod to the booster needs to be adjusted...not sure why if you didn't fiddle with it. Some high performance engines with extreme cam profiles do not make enough vacuum at low speeds/idle to operate the booster...if that is the case, you need to add another vacuum tank to the system or a vacuum pump like some diesels have or a hydro-assisted brake booster which some diesels also use....that can get expensive with all the additional p/s pump and lines and booster. You could run a piece of the correct size hose from your booster to another test car with known good vacuum to see it it's a vacuum issue.
You say the booster is ok but you may need to double check it....The booster diaphram may be leaking/bad or not getting enough vacuum to assist the brakes. Check to make sure the vacuum hose to the booster is connected to the correct manifold or carb tap for vacuum and that the check valve in it is ok. It could also be that the pedal pushrod to the booster needs to be adjusted...not sure why if you didn't fiddle with it. Some high performance engines with extreme cam profiles do not make enough vacuum at low speeds/idle to operate the booster...if that is the case, you need to add another vacuum tank to the system or a vacuum pump like some diesels have or a hydro-assisted brake booster which some diesels also use....that can get expensive with all the additional p/s pump and lines and booster. You could run a piece of the correct size hose from your booster to another test car with known good vacuum to see it it's a vacuum issue.