Brake System Troubles - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kfreeman1966 · 03-17-2011, 08:42 PM

Ok here goes- I have a 66 with a 350 engine. I have been completely redoing the truck from frame off...... I have new brake lines from front to rear.... Disc on the Front... Drum on the back... a new master/booster combo from Tuff- stuff.... I have completely redone the rear drums all new stuff... as well as the fronts... I used the old calipers though because they are in really great condition. Here is the problem... after completely bleeding the system, I have a great hard brake pedal until I crank the engine, then the pedal goes right to the floor........ I have re-blead the system and checked all the line connections...

???? anyone have any answers as to how to fix this ????

Thanks, Keith

**Corts60** · 03-17-2011, 09:06 PM

Are you getting a good straight stream out of each bleed valve? Did you top off the reservoir?

kfreeman1966 · 03-17-2011, 09:29 PM

Yes, I'm getting a pretty good stream out of each bleeder valve. and I did make sure and top off the reservoir.

protrash64 · 03-17-2011, 11:48 PM

Are the rear drum shoes adjusted out for a friction fit when installing the drum??

kfreeman1966 · 03-18-2011, 05:29 PM

I checked them and the are rubbing the pads when I turn them. I have also spoken with another guy, and he said to check the vacuum when the motor is at 2500 RPM. I did and still no luck. .... I bleed the line into a bottle of fluid bubbles come out I shut it down when the bubbles disappear. I do this on all 4 wheels. I have a really hard pedal, I start it up and the pedal goes right to the floor. I start over bleeding and bubbles come out.....I've done this process about 6-8 times.... UUUGGGGHHHH!!!!!!!

Can you say frustration!!!

Keith

**Clyde65** · 03-18-2011, 07:06 PM

bad booster?

Do you have good vacumn on your hose to the booster?

03-17-2011, 08:42 PM	#1
kfreeman1966 Registered User Join Date: Jul 2010 Location: Winston, Ga. Posts: 42	Brake System Troubles Ok here goes- I have a 66 with a 350 engine. I have been completely redoing the truck from frame off...... I have new brake lines from front to rear.... Disc on the Front... Drum on the back... a new master/booster combo from Tuff- stuff.... I have completely redone the rear drums all new stuff... as well as the fronts... I used the old calipers though because they are in really great condition. Here is the problem... after completely bleeding the system, I have a great hard brake pedal until I crank the engine, then the pedal goes right to the floor........ I have re-blead the system and checked all the line connections... ???? anyone have any answers as to how to fix this ???? Thanks, Keith

03-17-2011, 09:06 PM	#2
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: Brake System Troubles Are you getting a good straight stream out of each bleed valve? Did you top off the reservoir? __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)

03-17-2011, 09:29 PM	#3
kfreeman1966 Registered User Join Date: Jul 2010 Location: Winston, Ga. Posts: 42	Re: Brake System Troubles Yes, I'm getting a pretty good stream out of each bleeder valve. and I did make sure and top off the reservoir.

03-17-2011, 11:48 PM	#4
protrash64 Resistance is Futile Join Date: Dec 2006 Location: Mesa,Arizona Posts: 3,520	Re: Brake System Troubles Are the rear drum shoes adjusted out for a friction fit when installing the drum?? __________________ 64 CHEVY PICK-UP > http://67-72chevytrucks.com/vboard/s...otrash+re-hash 64 CARRYALL >http://67-72chevytrucks.com/vboard/s...=1964+suburban 66 LB >http://67-72chevytrucks.com/vboard/s...d.php?t=427852 STRENGTH/DETERMINATION/MERCILESS/FOREVER .......posted via stationary device

03-18-2011, 05:29 PM	#5
kfreeman1966 Registered User Join Date: Jul 2010 Location: Winston, Ga. Posts: 42	Re: Brake System Troubles I checked them and the are rubbing the pads when I turn them. I have also spoken with another guy, and he said to check the vacuum when the motor is at 2500 RPM. I did and still no luck. .... I bleed the line into a bottle of fluid bubbles come out I shut it down when the bubbles disappear. I do this on all 4 wheels. I have a really hard pedal, I start it up and the pedal goes right to the floor. I start over bleeding and bubbles come out.....I've done this process about 6-8 times.... UUUGGGGHHHH!!!!!!! Can you say frustration!!! Keith

03-18-2011, 07:06 PM	#6
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Brake System Troubles bad booster? Do you have good vacumn on your hose to the booster? __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*



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