Rear brake problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

xtreme80 · 11-08-2007, 07:55 PM

When I put my new rear end in the truck, I used the brakes on that one, instead of using my old ones (mine were trashed anyways). We bled the brakes, they worked great, and the next day they didn't work again. So we bled them again, and the very next day they didn't work again.

I've been watching the fluid level, and it's not getting low. There's also no leaks anywhere in the brake system. I was told that it may be possible for air to be getting in the rear lines or bleeders without fluid actually coming out, but I'm not sure how true this could be.

The only other thing I can think of, is a bad proportioning valve. But it seems odd that the valve would go bad right when the rear end was put in.

Anyone have any ideas?

**old Rusty C10** · 11-08-2007, 08:33 PM

as a rule of thumb if im going to change the rear i will change the rear hose . i would also if you got the rear out of a junkyard change the cylinders too i mean we are talking about $33 dollars extra, and that is just insurance
are you sure the brake line where you connected the rear together is seated right and there are no kinks in the steel brake lines

xtreme80 · 11-09-2007, 01:28 AM

Quote:

Originally Posted by old Rusty C10

as a rule of thumb if im going to change the rear i will change the rear hose . i would also if you got the rear out of a junkyard change the cylinders too i mean we are talking about $33 dollars extra, and that is just insurance
are you sure the brake line where you connected the rear together is seated right and there are no kinks in the steel brake lines

There shouldn't be kinks, cuz I can bleed them all day long and the fluid flows very freely through the bleeder. Also, the rear brakes are brand new on this truck, including cylinders and brake lines. It was spotless when I put it in, and it was completely obvious it was all new.

I'm going to try bleeding it one more time and see how that goes. I may even buy a couple new bleeder screws for the rear, and clean out the threads to make sure air isn't coming back in.

xtreme80 · 11-09-2007, 08:51 PM

Anyone?

**old Rusty C10** · 11-09-2007, 10:56 PM

I'm going to try bleeding it one more time and see how that goes. I may even buy a couple new bleeder screws for the rear, and clean out the threads to make sure air isn't coming back in.
__________________
good idea

Ivan D. · 11-10-2007, 04:40 AM

Do you have a loose fitting somewhere on the lines? I had a similar issue, rear brakes would bleed but as I used them they would soften, turns out one of the fittings in the engine bay wasn't sealing quite right - replace the fitting, all is good.

11-08-2007, 07:55 PM	#1
xtreme80 Wishin' I had more money! Join Date: Feb 2007 Location: Eugene, OR Posts: 1,242	Rear brake problems When I put my new rear end in the truck, I used the brakes on that one, instead of using my old ones (mine were trashed anyways). We bled the brakes, they worked great, and the next day they didn't work again. So we bled them again, and the very next day they didn't work again. I've been watching the fluid level, and it's not getting low. There's also no leaks anywhere in the brake system. I was told that it may be possible for air to be getting in the rear lines or bleeders without fluid actually coming out, but I'm not sure how true this could be. The only other thing I can think of, is a bad proportioning valve. But it seems odd that the valve would go bad right when the rear end was put in. Anyone have any ideas?

11-08-2007, 08:33 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,300	Re: Rear brake problems as a rule of thumb if im going to change the rear i will change the rear hose . i would also if you got the rear out of a junkyard change the cylinders too i mean we are talking about $33 dollars extra, and that is just insurance are you sure the brake line where you connected the rear together is seated right and there are no kinks in the steel brake lines __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

11-09-2007, 08:51 PM	#4
xtreme80 Wishin' I had more money! Join Date: Feb 2007 Location: Eugene, OR Posts: 1,242	Re: Rear brake problems Anyone?

11-09-2007, 10:56 PM	#5
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,300	Re: Rear brake problems I'm going to try bleeding it one more time and see how that goes. I may even buy a couple new bleeder screws for the rear, and clean out the threads to make sure air isn't coming back in. __________________ good idea __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

11-10-2007, 04:40 AM	#6
Ivan D. glamoros piece o' lowlife Join Date: Mar 2007 Location: Redford, MI Posts: 1,164	Re: Rear brake problems Do you have a loose fitting somewhere on the lines? I had a similar issue, rear brakes would bleed but as I used them they would soften, turns out one of the fittings in the engine bay wasn't sealing quite right - replace the fitting, all is good. __________________ The more I drink, the more I drink, the more I drink... diesel, reg cab, long bed, 4 across the rear, single stack, wooden stakes, and lotsa lights - the Hay Express



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