Put the board to use-Brake Problem 89 Sub - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Locutus · 09-14-2003, 04:05 PM

The brake warning light keeps coming on in my 89 Sub. We recently redid the brakes front and back. I checked for air in the lines and rebleed them, there was no air in the lines and the MC is full on both chambers. The light will go out if you stomp on the brakes while sitting still, but it comes back on when you stop suddenly or press hard on the pedal. Any ideas?

Mike

*mike reeh* · 09-15-2003, 01:30 AM

you SURE you got the air out of the lines? You can always disconnect that little connector @ the proportioning valve. Maybe the valve and/or sensor is bad

mike

Krosati · 09-19-2003, 02:46 PM

You still have air in the lines. You may need to bleed the MC before doing the lines. You also may have your rear adjusters out of wack. Tighten them up a bit and check it again.

Locutus · 09-19-2003, 04:06 PM

There is no way to adjust them there are no holes on the backing plates of the rear brakes.

**old Rusty C10** · 09-19-2003, 09:40 PM

some vehicles have the adjuster access right on the front of the drum

Krosati · 09-20-2003, 11:19 AM

If you don't want to knock out the plugs on the face of the drums, you cam manually adjust them until you can just slide the drums on. After everthing id assembed, drive the sub in reverse (5-6 mph) and firmly apply the brakes. This is how the adjusters work anyway. Get in the habit of using your brakes when you back up rathe rather than shifting to neutral then drive.

Locutus · 09-20-2003, 06:21 PM

I always apply the brakes going into reverse and before shifting into drive. I think it would be fool hardy to do otherwise. When I replaced the rear brakes we did adjust them till the drums just slid on and I put in reverse and applied the brakes several times till I felt secure that the rear brakes were catching.

09-14-2003, 04:05 PM	#1
Locutus Registered User Join Date: Jan 2003 Location: Santa Fe, Texas Posts: 249	Put the board to use-Brake Problem 89 Sub The brake warning light keeps coming on in my 89 Sub. We recently redid the brakes front and back. I checked for air in the lines and rebleed them, there was no air in the lines and the MC is full on both chambers. The light will go out if you stomp on the brakes while sitting still, but it comes back on when you stop suddenly or press hard on the pedal. Any ideas? Mike

09-19-2003, 09:40 PM	#5
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,312	some vehicles have the adjuster access right on the front of the drum __________________ 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!!

09-15-2003, 01:30 AM	#2
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 683	you SURE you got the air out of the lines? You can always disconnect that little connector @ the proportioning valve. Maybe the valve and/or sensor is bad mike

09-19-2003, 02:46 PM	#3
Krosati Registered User Join Date: Jul 2003 Location: Texas Posts: 49	You still have air in the lines. You may need to bleed the MC before doing the lines. You also may have your rear adjusters out of wack. Tighten them up a bit and check it again.

09-19-2003, 04:06 PM	#4
Locutus Registered User Join Date: Jan 2003 Location: Santa Fe, Texas Posts: 249	There is no way to adjust them there are no holes on the backing plates of the rear brakes.

09-20-2003, 11:19 AM	#6
Krosati Registered User Join Date: Jul 2003 Location: Texas Posts: 49	If you don't want to knock out the plugs on the face of the drums, you cam manually adjust them until you can just slide the drums on. After everthing id assembed, drive the sub in reverse (5-6 mph) and firmly apply the brakes. This is how the adjusters work anyway. Get in the habit of using your brakes when you back up rathe rather than shifting to neutral then drive.

09-20-2003, 06:21 PM	#7
Locutus Registered User Join Date: Jan 2003 Location: Santa Fe, Texas Posts: 249	I always apply the brakes going into reverse and before shifting into drive. I think it would be fool hardy to do otherwise. When I replaced the rear brakes we did adjust them till the drums just slid on and I put in reverse and applied the brakes several times till I felt secure that the rear brakes were catching.



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