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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Hi, sorry to hear about your problem. It sounds like you may have more than one problem. If the peddle goes all the way down to the floor you might have a leak checked the reservoir, or you could have air in the line, if you overheated your brakes bad you might have boiled the fluid also. The brakes locking up could be a stuck caliper. This could be cause by the piston being dirty or rusty and not retrieving like it should. Also if the caliber does not slide freely this could be a problem. Another thing that could be causing your problem most people are not aware of is old brake hoses. When the rubber gets old its swells up and where it goes through the mounting brackets it creates a strangling effect. It's like a check valve under high pressure it goes in but it has a hard time going back. To check for this, when the problem occurs again. Jack up the car and find out which wheel the does not turn, then open the bleed screw or loose the hose. At caliber, if the rotor will turn now. That was your problem. Hopes this helps you.

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The anti lock light has just come on in my 1990 Acura Legend LS Coup but the brakes seem to be functioning just fine? just a sensor of an indication of a pending problem?


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1 Answer

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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