Question about 1999 Cadillac DeVille

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Car is hard to start and when starts chugs and brake becomes hard to push

It is hard to start and when it starts it chugs and the brake becomes hard to push and the gas does not rev the engine. And now it does not start at all.

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Sounds like bad vacuumed leak because of brake being hard.check that the hose from power brake diapham on fire wall to intake manifold in on not got a hole in it and if it seems ok pull hose off brake unit and plug and start.good luck.if that solves it replace brake booster.

Posted on Mar 23, 2014

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Brake booster appears not to be working properly. brakes work ok for 1 or 2 apps then pedal gets hard. cannot hear any vacume leaks. the car does have a vacume switch in the booster


the booster is the problem, or a hole or leak in vacuum line to booster check the check valve also ! from manifold. heres the symtoms of a bad brake booster. primary symtom is a hard pedal on application, to test booster. pump brakes several times with engine off. to deplete stored vacuum. turn on engine with pushing slightly on brake pedal. you should feel the pedal fade away abit and then become firm. but not hard. if you feel nothing at pedal when engine starts, brake booster is not working! check the vacuum lines first!!

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