Brake proportioning valve...

[steelydan]

1999 Suburban k2500. Does it have a load sensing proportioning valve? I have 1300lbs or so of ironer parts in the back and the brakes work much better. I know on my toyota I used to bend the linkage to give the back brakes a little more grab. I don't remember seeing a load sensing valve on these trucks.

[bk95td]

I don't think gm used those since the 80's. ABS controls how much brakes the rear gets.

[Missy Good Wench]

These trucks use a combination valve to control rear brakes and to set the light on the dash should pressure be lost.

The springing or valving on some of these has issues and they stop putting enough pressure to the rear brakes.

My 94 has the same issue but its still OK.

If its a problem, change the Combination valve and bleed the system out.

MGW

[Matt Bachand]

Probably stopping better because the rear's are actually working with weight. Your pedal will travel more as the fronts alone can't stop it before the rear's kick in.

I have seen over-sized wheel cylinders, but have never heard from anyone who tried them.

I saw those oversized wheel cylinders when looking at the rear disc conversion companies websites. Turbine Doc's company specifically. Give em a shot, they weren't much cake.

Are they well adjusted? Either jack it up and adjust them, or go into a parking lot and roll backwards fairly quick, and snap the brake pedal hard about 10 times and see if its better pedal.

Never liked drums..... audo adjust? yeah right.

[mmcna]

http://www.dieselplace.com/forum/att...3&d=1206332902
I have not tried this, but there are many posts about brake adjustment and uneven wear here and on the other site.

My pads on the front wear unevenly and used to pull to the right really bad before I rebuilt the whole system. I believe the key is to keep the rear brakes adjust properly.

[guybb3]

I have seen over-sized wheel cylinders, but have never heard from anyone who tried them.

You never asked me, Matt.

[mmcna]

You never asked me, Matt.

So do larger cylinders help?

[ghitch75]

http://www.dieselplace.com/forum/att...3&d=1206332902
I have not tried this, but there are many posts about brake adjustment and uneven wear here and on the other site.

My pads on the front wear unevenly and used to pull to the right really bad before I rebuilt the whole system. I believe the key is to keep the rear brakes adjust properly.

great info!!!!!......burb goin' to get a brake redo.....i have EBC vented rotors and EBC ULTIMAX pads...they will stay just new pads....all the rest will go....then the thing might stop!!!!

[docdray]

These trucks use a combination valve to control rear brakes and to set the light on the dash should pressure be lost.

The springing or valving on some of these has issues and they stop putting enough pressure to the rear brakes.

My 94 has the same issue but its still OK.

If its a problem, change the Combination valve and bleed the system out.

MGW

my 94 is finally beyond not repairing. have continued to readjust rears over last year, but now the fronts start to cook with load. using parking brake in emergencies, guess I gotta do something this weekend.

[Matt Bachand]

You never asked me, Matt.

Good info to add to this thread!

Any more breaking power? Any pedal change? Can you make the rears lockup easier? (easiest to tell the hard way in the snow!)

[guybb3]

Good info to add to this thread!

Any more breaking power? Any pedal change? Can you make the rears lockup easier? (easiest to tell the hard way in the snow!)

Absolutely added more power to the rears. iirc I only went 1/16 of an inch bigger. Stock is 1". Need to keep the rears adjusted as you get more pedal travel if they aren't kept well adjusted. I'll look tonight to make sure of the size. I bought them from EBC brakes. When the drums are not servicable or I get more money, I'm going to rear disc. TSM is the kit I'm looking at.

[Matt Bachand]

Absolutely added more power to the rears. iirc I only went 1/16 of an inch bigger. Stock is 1". Need to keep the rears adjusted as you get more pedal travel if they aren't kept well adjusted. I'll look tonight to make sure of the size. I bought them from EBC brakes. When the drums are not servicable or I get more money, I'm going to rear disc. TSM is the kit I'm looking at.

Rear disc is a win/win. Not only way better stopping power, but less weight (especially on duallies!) and will actually feel more power as well as braking.

Subtract the cost of the new drums/shoes to the conversion price, and its the way to go.

I'm renovating my brakes next year I think. My rotors wear pattern is getting smaller and smaller, although they could probably be turned, I'd rather replace with some high performance vented rotor or something.

You using those?

With a DRW changing rotors is a nasty job with those extension hubs. I may time it with my P.S. Hub if it holds out till next year, as it needs to come apart anyhow.

FWIW I have had absolutely excellent luck with Cermanic pads.

I think I'll do them oversized wheel cylinders also.

[THEFERMANATOR]

http://www.dieselplace.com/forum/att...3&d=1206332902
I have not tried this, but there are many posts about brake adjustment and uneven wear here and on the other site.

My pads on the front wear unevenly and used to pull to the right really bad before I rebuilt the whole system. I believe the key is to keep the rear brakes adjust properly.

I just put this valve in FRANKENBURBAN yesterday as the added weight in the front end was causing a bad nose dive on braking. Also when the nose went down it would lift the rear up and the rear tires would begin to hop around and it would go either direction it wanted to. The valve made a definate improvement in braking that is noticeable.

[ghitch75]

draggin' up an old ghost......just gettin' around to doin' my brakes....where in the world is the Brake proportioning valve?.....i can't find it?...on my burb btw...

[THEFERMANATOR]

It mounts into the end of the ABS module.