The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 09-05-2017, 11:42 PM   #1
studeclunker
Registered User
 
studeclunker's Avatar
 
Join Date: Mar 2007
Location: Fawn Lodge, Ca.
Posts: 57
squishy brake pedal

How does that song, Wolf Creek Pass, go? "Steppin' on the brakes was like steppin' on a plum!" Or something like that.

I started the truck today and the pedal went straight to the floor! They held and when I released the brake the truck rolled in reverse like it should. Afterwards the pedal was squishy, but not on the floor and still working. Any ideas???

'66 custom camper
350 engine
power drum brakes
Power assist steering
auto tranny.
studeclunker is offline   Reply With Quote
Old 09-06-2017, 01:06 AM   #2
mongocanfly
Senior Member
 
Join Date: May 2015
Location: alabama
Posts: 3,983
Re: squishy brake pedal

fluid level or bad master or wheel cylinder
mongocanfly is online now   Reply With Quote
Old 09-06-2017, 09:49 PM   #3
68gmsee
Active Member
 
68gmsee's Avatar
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,738
Re: squishy brake pedal

^ As above...

If you don't see any fluid on the wheels or outside the master cylinder, suspect the internal piston seal of the master cylinder gone bad. The cup seal allows fluid past it and the brake feels mushy.

Don't take any chances of complete failure and replace it. They're not expensive and fairly easy to replace. Just remember to follow bleeding directions of the master cylinder carefully and also bleed the brakes.
__________________
68 GMC 250/3 speed Saginaw p/b p/s
69 Chevy 350/350 currently in pieces still lookin for a cab
06 Trailblazer
I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...
68gmsee is offline   Reply With Quote
Old 09-06-2017, 11:13 PM   #4
mongocanfly
Senior Member
 
Join Date: May 2015
Location: alabama
Posts: 3,983
Re: squishy brake pedal

jinxed me...my master went out today in my 81..went to stop..pedal went to floor...check reservoir. .empty..got to looking and it was leaking out around the pushrod....now the suprise..I went to oreillys and a rebuilt master is only $19..and I get $10 back for the core...so the rebuilt master turned costing $9
mongocanfly is online now   Reply With Quote
Old 09-07-2017, 08:16 PM   #5
mattfranklin
Senior Member
 
mattfranklin's Avatar
 
Join Date: Dec 2011
Location: Moraga, CA
Posts: 302
Re: squishy brake pedal

Quote:
Originally Posted by mongocanfly View Post
jinxed me...my master went out today in my 81..went to stop..pedal went to floor...check reservoir. .empty..got to looking and it was leaking out around the pushrod....now the suprise..I went to oreillys and a rebuilt master is only $19..and I get $10 back for the core...so the rebuilt master turned costing $9
That doesn't happen very often. Wow!
__________________
(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1

http://67-72chevytrucks.com/vboard/s...d.php?t=567340
mattfranklin is offline   Reply With Quote
Old 09-07-2017, 08:58 PM   #6
70K10Hunter
Senior Member
 
70K10Hunter's Avatar
 
Join Date: Jun 2012
Location: Hill Country
Posts: 390
Re: squishy brake pedal

Quote:
Originally Posted by mongocanfly View Post
jinxed me...my master went out today in my 81..went to stop..pedal went to floor...check reservoir. .empty..got to looking and it was leaking out around the pushrod....now the suprise..I went to oreillys and a rebuilt master is only $19..and I get $10 back for the core...so the rebuilt master turned costing $9
crap go buy a spare.
70K10Hunter is offline   Reply With Quote
Old 09-07-2017, 09:33 PM   #7
mongocanfly
Senior Member
 
Join Date: May 2015
Location: alabama
Posts: 3,983
Re: squishy brake pedal

I should have added the reason for me stopping was "that old lady" that pulled out in front of me causing me to stand on the brakes hard ..that's what led to this...lucky for the wide slot in the road... that kept me from hitting her
mongocanfly is online now   Reply With Quote
Old 09-12-2017, 12:44 AM   #8
studeclunker
Registered User
 
studeclunker's Avatar
 
Join Date: Mar 2007
Location: Fawn Lodge, Ca.
Posts: 57
Re: squishy brake pedal

Took me a while to get the lid off the MC. Yeah, no fluid. So I checked around all four wheels after filling it. Looks like the left rear might be weeping. She gave good pedal today and stopped on a dime with nine cents change! Will have to go around and work on all four cylinders. Might just replace all of them including the master, better safe than sorry. Thanks for the hints.
studeclunker is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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

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

Forum Jump


All times are GMT -4. The time now is 04:54 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com