Brakes problem on '67 C10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

briarpatch · 05-11-2005, 11:44 AM

I had a brake job done about 15k miles ago. They have worked well until several months ago. With increasing frequency, the brake pedal goes to the floorboard with no resistance, and I have to pump the pedal to stop. I am not experiencing any brake fluid loss at all. Any tips on where to start troubleshooting will be appreciated.

70c10 · 05-11-2005, 12:42 PM

Have you pulled the wheels to verify the wheel cylinders are not wet?

OhioDan · 05-11-2005, 02:45 PM

Master cyl. by-passing? That's where I'd look first.

**CPNE** · 05-11-2005, 04:17 PM

Quote:

Originally Posted by OhioDan

Master cyl. by-passing? That's where I'd look first.

briarpatch · 05-11-2005, 05:00 PM

Thanks for the responses. I'll have a look at the wheel cylinders, but it looks like the consensus is to replace master cylinder...

**john** · 05-11-2005, 08:11 PM

Don't forget to check the adj. the self adjusters have been known to malfunction. This will also cause you to pump them up. John

briarpatch · 05-11-2005, 09:21 PM

Quote:

Originally Posted by john

Don't forget to check the adj. the self adjusters have been known to malfunction. This will also cause you to pump them up. John

Thanks, John. I'll have a look at the adjusters too...

69 longhorn · 05-11-2005, 10:34 PM

Yup, it sounds like you have a bad master cyl....

L

05-11-2005, 11:44 AM	#1
briarpatch Registered User Join Date: May 2005 Location: Beauregard, AL Posts: 64	Brakes problem on '67 C10 I had a brake job done about 15k miles ago. They have worked well until several months ago. With increasing frequency, the brake pedal goes to the floorboard with no resistance, and I have to pump the pedal to stop. I am not experiencing any brake fluid loss at all. Any tips on where to start troubleshooting will be appreciated. __________________ ------------------------------------- Tim '67 C/10, '04 Tahoe ------------------------------------- Last edited by briarpatch; 05-11-2005 at 03:59 PM.

05-11-2005, 12:42 PM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Have you pulled the wheels to verify the wheel cylinders are not wet? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

05-11-2005, 02:45 PM	#3
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	Master cyl. by-passing? That's where I'd look first. __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.

05-11-2005, 05:00 PM	#5
briarpatch Registered User Join Date: May 2005 Location: Beauregard, AL Posts: 64	Thanks for the responses. I'll have a look at the wheel cylinders, but it looks like the consensus is to replace master cylinder... __________________ ------------------------------------- Tim '67 C/10, '04 Tahoe -------------------------------------

05-11-2005, 08:11 PM	#6
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Don't forget to check the adj. the self adjusters have been known to malfunction. This will also cause you to pump them up. John __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

05-11-2005, 10:34 PM	#8
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Yup, it sounds like you have a bad master cyl.... L __________________ http://community.webshots.com/user/hotrodhorn



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