My brakes pull to the left hard - ideas? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**aerotruk63** · 07-06-2009, 07:34 PM

I pressure bled my brakes on my truck and on the firetruck as well. This way your sure all the air is out. Sounds like a line is collapsing but why to three cylinders and not just the back? If the truck is up on blocks and someone is pushing on the brake pedal,do all the wheels brake or just the front left?

justbad · 07-06-2009, 07:52 PM

turn right while braking

ksbrktracer · 07-06-2009, 09:14 PM

I say brake hoses.......even if they look good, I had a new cheap offshore made hose one time that had issues with, truck always pulled after new hoses, took a while to figure out but the hose was collapsing, put name brand hoses on ......NO PROBLEMS after that

**Corts60** · 07-07-2009, 10:29 PM

Quote:

Originally Posted by justbad

turn right while braking

**Corts60** · 07-07-2009, 10:32 PM

Definitely check your adjusters.....There should be just a little drag that you can hear when you spin the wheel by hand while it is on jackstands.

Alan's Classic · 07-07-2009, 11:30 PM

Check your hard lines for kinks or pinched areas if you hadn't already done so.

hotrodf1 · 07-08-2009, 08:55 PM

Tried to put a new Raybestos hose on the pass side tonight, but a storm rolled in and made me run for cover. Just about had it bled, too. Oh well.

I did a cursory check on the lines, but I guess I should probably do that again just to be sure.

hotrodf1 · 07-20-2009, 08:45 PM

Here's an update.

I replaced the brake hose and that didn't seem to help. So I took all the brake lines out of the truck and all the Tee's, blew through all, check them all, replaced the short lines from the tees to the front wheels cause someone had wrecked them previously.

I had been having some issues pressure bleeding the LF wheel. Always seemed to have some bubbles no matter how much fluid I put through. Bleed it the tradtional way and the bubbles aren't there. Took the MC off and tried to bench bleed it, had not much luck after a couple hours and it appeared to leak (maybe my fault, was probably pushing the piston in too far).

Drove to the parts store and bought another new MC (had been replaced by previous owner). That one bench bled no problem, like I thought it should. Now I'm thinking, cool, must be the MC. Installed back in truck along with cleaned out lines, etc. Bleed the system again, things seem to go smoothly.

I take the truck back out and it still pulls to the left when I brake, pretty much acts the same way it did before, although it does seem to have a little better pedal feel, and it seems like it slows you down quicker than before. BUt the pulling is definetely still there.

I'm running out of ideas. I just have to think its in the suspension somewhere. Maybe some bad bushings in the upper A arm or ?????

Anyone have any thoughts of what to try next?

This past weekend someone suggested that I start swapping brake parts side for side to see what that does. The shoes are brand new, shouldn't be that, since it pulled with the old shoes too. Are there different sized wheel cylinders available? Maybe one is bigger bore than the other resulting in more braking force with the same brake system pressure?

hotrodf1 · 07-07-2009, 10:26 PM

Quote:

Originally Posted by aerotruk63

I pressure bled my brakes on my truck and on the firetruck as well. This way your sure all the air is out. Sounds like a line is collapsing but why to three cylinders and not just the back? If the truck is up on blocks and someone is pushing on the brake pedal,do all the wheels brake or just the front left?

While I had the peddle held to the floor with a clamp before I let the pressure out of the right front wheel cylinder I did notice that the drum was in fact locked up as if the brakes were working somewhat anyway.

I know that the rubber lines were replaced at one point, maybe with some cheap stuff, that could be it. I'll try a new hose to see what happens.

I noticed that the fluid didn't seem to come out from right front with the same amount of force as the left front. Wasn't sure if I was imagining things or not. Was working in the dark in the driveway. 48 Ford F-1 and 68 Camaro taking up what itty bitty garage I have.

Thanks for the replies everyone, will keep you posted.

07-06-2009, 07:34 PM	#1
aerotruk63 Check The Champ, Demonstrator Join Date: Jun 2009 Location: Montreal,Quebec Posts: 6,627	Re: My brakes pull to the left hard - ideas? I pressure bled my brakes on my truck and on the firetruck as well. This way your sure all the air is out. Sounds like a line is collapsing but why to three cylinders and not just the back? If the truck is up on blocks and someone is pushing on the brake pedal,do all the wheels brake or just the front left? __________________ 1963 *Chevrolet Truck* Literature LINK: https://picasaweb.google.com/113840717762774560215 YouTube Channel with 20+ Original *Chevrolet Truck* Salesmen, Mechanics & Service Department Training Slideshows. https://www.youtube.com/results?sear...otruk63&page=1

07-06-2009, 07:52 PM	#2
justbad Registered User Join Date: Jun 2009 Location: inverness fl Posts: 41	Re: My brakes pull to the left hard - ideas? turn right while braking

07-06-2009, 09:14 PM	#3
ksbrktracer TNT-MOTORSPORTS Join Date: Mar 2008 Location: TULSA OKLAHOMA Posts: 2,692	Re: My brakes pull to the left hard - ideas? I say brake hoses.......even if they look good, I had a new cheap offshore made hose one time that had issues with, truck always pulled after new hoses, took a while to figure out but the hose was collapsing, put name brand hoses on ......NO PROBLEMS after that

07-07-2009, 10:32 PM	#5
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,698	Re: My brakes pull to the left hard - ideas? Definitely check your adjusters.....There should be just a little drag that you can hear when you spin the wheel by hand while it is on jackstands. __________________ 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)

07-07-2009, 11:30 PM	#6
Alan's Classic 1 thing at a time is progress. Join Date: Jun 2007 Location: Ball Ground GA Posts: 5,511	Re: My brakes pull to the left hard - ideas? Check your hard lines for kinks or pinched areas if you hadn't already done so. __________________ Alan Philippians 2:14-16 Alan's Classic Facebook page. North Georgia Group Project 1965 Vitamin C-10 1995 GMC Sierra K1500 The "Wrecker"

07-08-2009, 08:55 PM	#7
hotrodf1 Registered User Join Date: Jul 2009 Location: Evansville, IN Posts: 18	Re: My brakes pull to the left hard - ideas? Tried to put a new Raybestos hose on the pass side tonight, but a storm rolled in and made me run for cover. Just about had it bled, too. Oh well. I did a cursory check on the lines, but I guess I should probably do that again just to be sure.

07-20-2009, 08:45 PM	#8
hotrodf1 Registered User Join Date: Jul 2009 Location: Evansville, IN Posts: 18	Re: My brakes pull to the left hard - ideas? Here's an update. I replaced the brake hose and that didn't seem to help. So I took all the brake lines out of the truck and all the Tee's, blew through all, check them all, replaced the short lines from the tees to the front wheels cause someone had wrecked them previously. I had been having some issues pressure bleeding the LF wheel. Always seemed to have some bubbles no matter how much fluid I put through. Bleed it the tradtional way and the bubbles aren't there. Took the MC off and tried to bench bleed it, had not much luck after a couple hours and it appeared to leak (maybe my fault, was probably pushing the piston in too far). Drove to the parts store and bought another new MC (had been replaced by previous owner). That one bench bled no problem, like I thought it should. Now I'm thinking, cool, must be the MC. Installed back in truck along with cleaned out lines, etc. Bleed the system again, things seem to go smoothly. I take the truck back out and it still pulls to the left when I brake, pretty much acts the same way it did before, although it does seem to have a little better pedal feel, and it seems like it slows you down quicker than before. BUt the pulling is definetely still there. I'm running out of ideas. I just have to think its in the suspension somewhere. Maybe some bad bushings in the upper A arm or ????? Anyone have any thoughts of what to try next? This past weekend someone suggested that I start swapping brake parts side for side to see what that does. The shoes are brand new, shouldn't be that, since it pulled with the old shoes too. Are there different sized wheel cylinders available? Maybe one is bigger bore than the other resulting in more braking force with the same brake system pressure?



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