1993 Lexus LS 400 cant figure out why pedal goes to the flo

Tiny
SPOOKEYDOOKIE
  • MEMBER
  • 1993 LEXUS LS 400
  • V8
  • AWD
  • AUTOMATIC
  • 200,000 MILES
Just replaced front brakes because they were pulling to one side. Got those on and bled the brakes and pedal was really spongy after bleeding. So I bought a master cylinder hoping that would fix it and went through the whole process of bleeding brakes and master cylinder and still pedal is really spongy have any advice
Wednesday, September 30th, 2009 AT 3:25 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If there's no leak anywhere-could be a bad master cylinder or if you have an ABS unit could be coming from there.
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Wednesday, September 30th, 2009 AT 3:43 PM
Tiny
SPOOKEYDOOKIE
  • MEMBER
  • 3 POSTS
Like I said I already replaced master cylinder and theres no leaks. Do the brake pad sensors have to be hooked up?
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Thursday, October 1st, 2009 AT 5:53 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You sure its not the M/C I've done new ones and end up being defective has an internal leak in it not maintaining the hydraulic pressure. Do you have an antilock brakes? If so could be it causing the problem. The sensor has nothing to do with a spongy brakes-
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Thursday, October 1st, 2009 AT 6:00 PM
Tiny
SPOOKEYDOOKIE
  • MEMBER
  • 3 POSTS
I just spent 230 some dollars on a BRAND NEW master cylinder! Could it be the brake booster? And of course I have anti lock brakes most modern cars do.
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Thursday, October 1st, 2009 AT 9:14 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the brake booster and the ABS unit don't work bring it in for further diagnosis
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Friday, October 2nd, 2009 AT 9:44 AM

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