Question about 1990 Lexus LS 400

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I have a 1990 Lexus LS 400 and the brakes have failed. I replaced the master cylinder, the brake lines and now being told the ABS "brains" of the braking system needs replacement. Has anyone had this problem and if so where can I can a rebuilt part that will solve my problem.

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  • eellbb Jan 11, 2009

    I originally took the car to Mieneke. They said it was a mastecylinder, which they replaced. After the brakes failed again they replaced on of the brake lines and that did not work. Now Lexus is telling me I need a ABS "brain" for the braking system and that part cost $2200.



    I don't know if anyone knows what is wrong.

  • John Jon May 11, 2010

    Hello are you finished gue$$ing now $$$??. if the brakes failed it being 1990 i would look closely at the abs pump! test it before replacement again and you obviously do not know what your doing I recommend stop gue$$ing before you or someone else gets hurt from your gue$$ game you have going if these work for a day and fail because of your obevious lack of knowledge and experience you might find your self needing some traffic legal advice will you gue$$ your way through that to?hey don't take this the wrong way! if it was a starter problem or fuel problem fine but brakes are nothing to play with i have seen this before!!!!

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If the pedal is spongy you may still have air in the lines. If there are no brakes at all you may need to adjust the push rod for the master cyl. If the ABS has a fault it will set a code and the rest of the brake sys. will work normally

Posted on Jun 16, 2009

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1 Answer

Why does the reverse lights and the drive light go on when I step on the brakes on my 1990 lS 400 Lexus?


Check your brake wires connections because it seems that some wires are inccorectly installed and need to to inspected and refixed

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Best case scenario bad vacuum pressure to the brake booster. Worst case bad abs control module or valve body/motor the abs system works by add and removing hydraulic pressure through valves and electric motor. Try using block off plugs at the master cylinder( remove lines plug outlets at master cylinder) check if brake pedal position and pressure is good(if there is no change problem is master cylinder or brake booster/ vacuum) if plugging at master cylinder solved issue repeat procedure at abs valve body after reinstalling lines from master cylinder if your problem returns your issue is in the abs valve body if plugging at the abs solves problem reconnect at the valve body bleed each line one by one testing between each line until you find the problem

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The ABS brain block is defective! Will have to be replaced. Big aluminum block with a lot of lines to it. =Usually down low under the master cyl.

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1 Answer

Does the 1990 Lexus LS400 master cylinder come with traction control?


traction control is a separate system. If traction control or ABS is a problem they are taken out of the loop and the normal brakes still work. The master is for the brake system/ The ABS module and valve body and wheel sensors are your traction/antiskip system.

Jul 24, 2010 | 1990 Lexus LS 400

1 Answer

Brake booster is leaking, how envolved is it to replace.


Trivial. If it is vacuum that is leaking I assume. (If it is fluid, then it is actually the master cylinder and not the booster that is leaking.)
There are just 2 bolts holding the master cylinder to the booster. You don't have to take off the brake lines, just bend them a little.
Take off the vacuum hose.
Then there are usually 4 bolts holding the booster to the firewall.
Sometimes hard to reach them under the dash.
When you replace the booster, try to ensure the brake pedal rod slips into the right place in the booster.
After replacing the master, then make sure the brake pedal clearance is also enough, since the new booster could be slightly different size then the original.

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1 Answer

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check the vacum lines going to the brake booster. if everything is connected properly you may need a new booster.

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

Apr 12, 2009 | 1990 Lexus LS 400

1 Answer

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you need to bleed them.

Jan 11, 2009 | 1990 Lexus LS 400

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