LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

brake issues

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Old 09-24-13, 07:59 PM
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drandyd
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Default brake issues

My brakes have noise, I am hearing a bumping noise when stopping and when hitting a bump, the break pedal pulsates and at times feel like they do not what to grab. It is like the anti lock system is engaging as if there is wheel slipping. The master cylinder was changed and the person did not bench bleed the unit. the pedal goes to the floor and at times the system seems to grab harder at different times on each side of the car causing a rocking motion of the car. Does anyone have an idea what is going on?

Last edited by RA40; 09-25-13 at 10:22 AM. Reason: spelling ;)
Old 09-24-13, 08:04 PM
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PureDrifter
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re-bleed. previous tech was a moron who probably missed air.

may need to bleed the ABS unit as well.
Old 09-25-13, 04:40 AM
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deanshark
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Originally Posted by PureDrifter
re-bleed. previous tech was a moron who probably missed air.

may need to bleed the ABS unit as well.
X2 I dont know if he was a moron but he did miss some air. If he didn't bench bleed the MC then there is probably air in the lines somewhere. Which would make it grab on one side but not the other and also the pedal going to the floor. Bleed all your brake lines starting with the farthest from the MC (with fresh fluid) and it should clear up.
Old 09-25-13, 06:20 PM
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drandyd
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Default brakes

Originally Posted by deanshark
X2 I dont know if he was a moron but he did miss some air. If he didn't bench bleed the MC then there is probably air in the lines somewhere. Which would make it grab on one side but not the other and also the pedal going to the floor. Bleed all your brake lines starting with the farthest from the MC (with fresh fluid) and it should clear up.
I appreciate the tip and will have it done thanks
Old 09-25-13, 06:21 PM
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drandyd
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Default brakes

Originally Posted by deanshark
X2 I dont know if he was a moron but he did miss some air. If he didn't bench bleed the MC then there is probably air in the lines somewhere. Which would make it grab on one side but not the other and also the pedal going to the floor. Bleed all your brake lines starting with the farthest from the MC (with fresh fluid) and it should clear up.
thanks for the tip
Old 09-25-13, 06:22 PM
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drandyd
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Default breaks

Originally Posted by PureDrifter
re-bleed. previous tech was a moron who probably missed air.

may need to bleed the ABS unit as well.
thanks for the tip
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