Home
Don't have an account? Create one now! It's always free!


Forgot Password
Ed's Auto Parts - Mention MOTORGEN for a Discount!
Motorgen Sponsor: McLeod Racing
Motorgen Sponsor: American Muscle - Add style and performance to your Stang
Motorgen Sponsor: Hall Fabrication & Racing
Motorgen Sponsor: Injectors Plus - Performance Fuel Delivery Systems
Reply
 
Thread Tools
Old 08-28-2015, 07:49 AM   #1
enkeivetteenkeivette is offline
Super Moderator
 
enkeivette's Avatar
 
Join Date: Dec 2007
Posts: 6,850
Default Soft Brakes

Diesel Jeep has extra play in the brake pedal. It makes contact, then feels soft and depresses more than usual. But if I pump it up it gets rid of the extra play.

Sound like air in the system or a bad booster? (MC is full).
__________________
I <3 forced induction.
  Reply With Quote
Old 08-28-2015, 07:55 AM   #2
94cobra69ss39694cobra69ss396 is offline
Fast & Filthy
 
94cobra69ss396's Avatar
 
Join Date: Jun 2008
Posts: 3,840
Default

Bleed the brakes to eliminate the chance of air in them. A spongy brake is usually air in the system. However, I can tell you that on my Suburban (1999 with front disk rear drum) it started to feel spongy when the front pads got low. It might have been the semi metallic pads getting soft or something but I bleed the brakes and it didn't have any air in the system. I replaced the pads with some ceramic pads, adjusted the rears and the pedal is firm again and it stops great.
  Reply With Quote
Old 08-28-2015, 12:40 PM   #3
Shaolin CraneShaolin Crane is offline
pain's fun, hit me again
 
Shaolin Crane's Avatar
 
Join Date: Sep 2009
Posts: 6,264
Default

Yep, if the pads are low it will feel spongy
__________________
Quote:
Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stopping the world!
  Reply With Quote
Old 08-28-2015, 11:25 PM   #4
enkeivetteenkeivette is offline
Super Moderator
 
enkeivette's Avatar
 
Join Date: Dec 2007
Posts: 6,850
Default

Weird. New pads going in tomorrow. Will bleed too. Thanks guys. No pun intended
__________________
I <3 forced induction.
  Reply With Quote
Old 08-29-2015, 04:50 PM   #5
VettezukiVettezuki is offline
I, Vettezuki
 
Vettezuki's Avatar
 
Join Date: Feb 2006
Posts: 14,754
Default

Had this on the Vette not long ago. It was just a bit of air in the system. Bled and refilled MC, poof, brakes again!
__________________
Motorgen on
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Motorgen on
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Motorgen Project Car
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(active)
Motorgen Project Car
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(back burner)
  Reply With Quote
Old 08-29-2015, 07:57 PM   #6
enkeivetteenkeivette is offline
Super Moderator
 
enkeivette's Avatar
 
Join Date: Dec 2007
Posts: 6,850
Default

ImageUploadedByTapatalk1440903170.783101.jpg

Ive put 70k miles on these brakes. Plus whatever mileage the first owner put on them, and they were at like 70%. Insane. Im not very hard on brakes apparently.

Brakes made it feel a bit better. Bled the lines and tried to move the old fluid out, felt a bit better.

Now they feel decent again, but still a bit spongy. Imagine making light contact with your foot at low speed, just sufficient to stop the car, but after the car stops your foot compresses the pedal an additional 3 inches.


Now I dont know if Im just paranoid and it was always like that, or if something else is wrong? Ug
__________________
I <3 forced induction.
  Reply With Quote
Old 08-29-2015, 09:19 PM   #7
VettezukiVettezuki is offline
I, Vettezuki
 
Vettezuki's Avatar
 
Join Date: Feb 2006
Posts: 14,754
Default

Quote:
Originally Posted by enkeivette View Post
Attachment 989

Ive put 70k miles on these brakes. Plus whatever mileage the first owner put on them, and they were at like 70%. Insane. Im not very hard on brakes apparently.

Brakes made it feel a bit better. Bled the lines and tried to move the old fluid out, felt a bit better.

Now they feel decent again, but still a bit spongy. Imagine making light contact with your foot at low speed, just sufficient to stop the car, but after the car stops your foot compresses the pedal an additional 3 inches.


Now I dont know if Im just paranoid and it was always like that, or if something else is wrong? Ug
Booster or MC may be sub-optimal.
__________________
Motorgen on
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Motorgen on
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Motorgen Project Car
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(active)
Motorgen Project Car
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(back burner)
  Reply With Quote
Old 09-09-2015, 01:31 PM   #8
enkeivetteenkeivette is offline
Super Moderator
 
enkeivette's Avatar
 
Join Date: Dec 2007
Posts: 6,850
Default

Brakes still stuck. Is the booster supposed to hold vacuum? Is that the best way to test it?

Any test for the MC? How does it fail?
__________________
I <3 forced induction.
  Reply With Quote
Old 09-09-2015, 07:57 PM   #9
94cobra69ss39694cobra69ss396 is offline
Fast & Filthy
 
94cobra69ss396's Avatar
 
Join Date: Jun 2008
Posts: 3,840
Default

When the master cylinder goes bad it bleeds off pressure so the peddle will go to the floor. When the booster goes bad it leaks vacuum so the brakes peddle is hard to push. Like when you try to press the brakes when the engine isn't running.

You also have ABS so the ABS system may be causing issues. Do you have any codes?
  Reply With Quote
Old 09-10-2015, 08:50 AM   #10
Shaolin CraneShaolin Crane is offline
pain's fun, hit me again
 
Shaolin Crane's Avatar
 
Join Date: Sep 2009
Posts: 6,264
Default

Sure it's a vacuum system and not a hydroboost system?
__________________
Quote:
Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stopping the world!
  Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -7. The time now is 04:45 AM.