basic brake diagnosis
New User
Joined: Apr 2002
Posts: 13
Likes: 0
From: Tucson USA
basic brake diagnosis
this is probably an easy question, but i would like to be sure for my own ease of mind.
in order for me to stop i have to pump the brake pedal about two to three times (almost like i am building pressure).
when i am stopped, if i let off the brake pedal just a bit and then press it down lightly, the pedal goes right to the floor with no resistance.
i have checked vaccum lines - no leaks. Checked front brake calipers - no fluid leakage. Checked rear wheel cylinders - no fluid leakage.
does anyone know what this could be? i just spent 2 grand replacing the bearings in my transmission, so i am trying locate this problem at the source and not replace everything.
thanks for the help,
herunar
in order for me to stop i have to pump the brake pedal about two to three times (almost like i am building pressure).
when i am stopped, if i let off the brake pedal just a bit and then press it down lightly, the pedal goes right to the floor with no resistance.
i have checked vaccum lines - no leaks. Checked front brake calipers - no fluid leakage. Checked rear wheel cylinders - no fluid leakage.
does anyone know what this could be? i just spent 2 grand replacing the bearings in my transmission, so i am trying locate this problem at the source and not replace everything.
thanks for the help,
herunar
Senior User
Joined: Jun 2002
Posts: 199
Likes: 0
basic brake diagnosis
[updated:LAST EDITED ON 08-Aug-02 AT 12:55 PM (EST)]sounds like the master has gone bad. but first I would bleed the brakes. If there is no air in the lines and you have no visable leaks the replace the master
Make sure that the parking brake is not stuck and over heating the brake fluid (i just went through that on my isuzu)
Make sure that the parking brake is not stuck and over heating the brake fluid (i just went through that on my isuzu)
New User
Joined: Apr 2002
Posts: 13
Likes: 0
From: Tucson USA
basic brake diagnosis
thanks for the replys!
i was thinking master cylinder, but i wasn't too sure. i didn't know if it could be that or the booster or the pressure differential valve.
i also haven't checked to see if my parking break is stuck and my warning light is not on.
if you all have any more suggestions, i am all ears.
thanks again,
herunar
i was thinking master cylinder, but i wasn't too sure. i didn't know if it could be that or the booster or the pressure differential valve.
i also haven't checked to see if my parking break is stuck and my warning light is not on.
if you all have any more suggestions, i am all ears.
thanks again,
herunar
Senior User
Joined: Jun 2002
Posts: 199
Likes: 0
basic brake diagnosis
The booster will not give you this type of problem. the differential switch will but ONLY IF IT IS LEAKING.
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New User
Joined: Apr 2002
Posts: 13
Likes: 0
From: Tucson USA
basic brake diagnosis
great! the differential valve is not leaking. i was really not looking forward to messing with that thing.
thank you for making my life easier.
herunar.
thank you for making my life easier.
herunar.
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Senior User
Joined: Sep 2001
Posts: 118
Likes: 0
From: Bothell USA
basic brake diagnosis
[updated:LAST EDITED ON 08-Aug-02 AT 06:48 PM (EST)]Just an Idea but have you looked at your rear adjusters they may be shot. I had this same thing happen o me on my 67 F-100 the pedal would go to the floor. Also try bleeding the system. Good Luck!
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