Brakes fade to soft - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Knot at Work · 10-17-2008, 08:58 PM

Hey fellas need a little help.

I have a 72 C10 LWB. I have disc front and drums rear. NO PWR Brakes and NO PWR steering. Brakes have slowly started to fade over the last few weeks. Usually no problems pumping and getting pressure and after a few miles downm the road Brakes stop well but when at idle and stopped pedal drops all the way to the floor, sometimes slowly, sometimes quickly, a few quick pumps get brakes working again.

Frequency is increasing.

Thoughts?

thanks

cdowns · 10-17-2008, 09:36 PM

sounds like a bad master cylinder. have you checked the brake fluid level lately?

Longhorn Man · 10-17-2008, 10:51 PM

pull the carpet (or rubber matt) back on the drivers side. Is there a wet spot rolling down the inside firewall eating the paint.
If so... go to the parts store and get a new master cylinder.
if not... bleed the brakes and adjust the rear shoes up.

LuckyHenriksen · 10-18-2008, 01:45 AM

Mine did the exact same thing and it was a bad MC

Steelawork'n · 10-18-2008, 01:45 PM

Yep, I agree. MC aren't hard to replace. The just look hard. You can do it in an hour with two guy (you and a friend, a son, a daughter, your wife etc) Bench bleed the MC. Install. Bleed the lines. Your good to go.

10-17-2008, 08:58 PM	#1
Knot at Work Registered User Join Date: Jul 2008 Location: Pensacola FL Posts: 27	Brakes fade to soft Hey fellas need a little help. I have a 72 C10 LWB. I have disc front and drums rear. NO PWR Brakes and NO PWR steering. Brakes have slowly started to fade over the last few weeks. Usually no problems pumping and getting pressure and after a few miles downm the road Brakes stop well but when at idle and stopped pedal drops all the way to the floor, sometimes slowly, sometimes quickly, a few quick pumps get brakes working again. Frequency is increasing. Thoughts? thanks

10-17-2008, 09:36 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Brakes fade to soft sounds like a bad master cylinder. have you checked the brake fluid level lately? __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

10-17-2008, 10:51 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Brakes fade to soft pull the carpet (or rubber matt) back on the drivers side. Is there a wet spot rolling down the inside firewall eating the paint. If so... go to the parts store and get a new master cylinder. if not... bleed the brakes and adjust the rear shoes up.

10-18-2008, 01:45 AM	#4
LuckyHenriksen Registered User Join Date: Oct 2007 Location: Sherwood Oregon Posts: 1,908	Re: Brakes fade to soft Mine did the exact same thing and it was a bad MC __________________ 1968 Yenko Chevy LWB 6.0L/TH400 3/4 Drop Senior Project Build Thread Here

10-18-2008, 01:45 PM	#5
Steelawork'n Just hang'n around Join Date: Nov 2005 Location: Camano Island WA Posts: 248	Re: Brakes fade to soft Yep, I agree. MC aren't hard to replace. The just look hard. You can do it in an hour with two guy (you and a friend, a son, a daughter, your wife etc) Bench bleed the MC. Install. Bleed the lines. Your good to go. __________________ Driving a '68 Chevy C20 and a '93 Astro Van. Lots and lots of mileage that I deduct each year.



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