Question about 1990 Lexus LS 400

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Brakes locking up Intermittent problem

The brakes will be fine and then act like you are pressing on the brakes as hard as possible while you are driving. Then it will go back to normal. It seems to happen after the car is parked for a bit. Now the brakes are soft like they need to be bleeded... but sometimes they will act fine all within a few minutes of driving.

The car is a LS 400 1996

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Your abs system is malfunctioning. i would suggest that you take the car to a dealership asap

Posted on Apr 12, 2009


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Anti lock brakes

Well this is very serious I hope you deal with it right away. You mentioned that sometimes the pedal was hard,do you mean that its all the way up and it doesnt feel like you have power brakes?? If so have you noticed any sounds like air escaping (swoosh sound when brakes applied)? Failure of the power booster causes pedal to become very hard and could possibly be your problem for hard pedal if I understood you correctly. check to make sure that vacuum to the booster is conected properly and hose not kinked..Now for the solution for the pedal fading to the floor... You either have air in your brake system, A bypassing master cylinder , or a hydraulic leak...Were your brakes serviced recently?? if so try bleeding your brake system first...That would be the first step if still the problem persist I would isolate exactly where the problem was coming from.. To do this you would start at the passenger rear wheel and line clamp the brake hose to make that part of your brake sytem inoperable...when clamped try your brakes and note if brakes improved or had know affect on system (when testing obviously im not suggesting you drive to determine results of test procedure)repeat test for each wheel you have isolated the problem when brakes feel normal with one wheel clamped,which ever it may be.. This isnt as hard as it might soun and if you are confused at all dont hesitate to ask questions... Remember the only dumb question is the one you fail to ask I would hate for you to get into an accident ... Good luck!!!

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