Chevy C/K Series Maintenance and Repair - READ ONLY

449 messages, Last post on Apr 14, 2008 at 11:01 AM

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What is this discussion about? Chevrolet R/V 2500 Series, Chevrolet C/K 10 Series, Chevrolet R/V 3500 Series, Chevrolet C/K 20 Series, Chevrolet C/K 30 Series, Chevrolet C/K 2500 Series, Chevrolet C/K 1500 Series, Chevrolet C/K 3500 Series, Truck

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#1 of 449 rear brakes locking up by 69flh Apr 26, 2004 (10:17 am)
I have a 1990 K2500 Chevy pickup with RWAL. I have had problems for quite sometime with the right rear wheel locking up when applying the brakes. I installed new rear shoes and it really compounded the problem. I then installed a new master cyl. & wheel cylinders and the problem still exists. Sometimes it feels as though the drum is warped as I get a vibration when applying the brakes but not always. I checked the drums and they are within .010 roundness. Is there any way to check the combination valve? This valve is pretty expensive and I hate to replace it and still have the same problem. Replies to this message: iplaybass (Dec 29, 2006 12:49 pm)
#2 of 449 Rather than redirect this one... by pf_flyer HOST Apr 26, 2004 (11:13 am)
We were in need of a "problems & solutions" topic for C/K series trucks, so I'm going to rename this one to make it the general problems topic where ALL C/K problems and fixes can be discussed... PF Flyer Host Pickups & News & Views Message Boards
#3 of 449 69flh by catam Apr 26, 2004 (12:34 pm)
It actually sounds like your wheel speed sensor may be bad. This is the sensor that tells the ABS whether or not the wheel is actually turning. I would check that next. Replies to this message: mtlhead (Jan 01, 2007 7:07 pm)
#4 of 449 69flh................ by dustyk Apr 26, 2004 (1:54 pm)
A bad speed sensor would be my first guess, too, but if I understand the problem correctly I would suspect the one that's bad is on the other side. Dusty Replies to this message: 69flh (Apr 27, 2004 6:28 am)
#5 of 449 Re: 69flh................ [dustyk #4] by 69flh Apr 27, 2004 (6:28 am)
Replying to: dustyk (Apr 26, 2004 1:54 pm) From what I can find this truck has one speed sensor located on the tail shaft of the transmission. I have not been under the truck yet to look at it and was wondering if anyone knows what is involved to replace it?
#6 of 449 Brake issues by akjbmw Apr 27, 2004 (7:01 am)
69th. Do you know that the left rear wheel brake is working correctly? Getting less pressure? If one wheel locks and the other doesn't, the drive shaft will turn twice as fast. If the sensor is on the drive shaft, it would see increased speed and apply some strange engineered logic control? It could be comparing front speed to rear speed and reduce braking to the slower of the two. If there was a weak/blocked pressure on one side, the problem could be exaggerated. How are those flex brake hoses?
#7 of 449 by 69flh Apr 27, 2004 (8:14 am)
Lines look good. When I bled the brakes, the fluid coming out of the bleeders did not appear restricted. You are right about "strange logic control". Sometimes the brakes really act up, especially when wet. Other times they are fine. I am still wondering about the combination valve, (the proportioning part of it.
#8 of 449 Re: RWAL Brake Sensors by dustyk Apr 27, 2004 (8:15 am)
I'm sorry, my brain was turned off when I sent that last message. Many manufacturers with RWAL Brakes only use one sensor. Dodge uses an encoder (they call it the exicter ring) made out of steel internal with the differential and mount a sensor on the rear axle housing. Since Dodge uses the GM-made American Axle on some of its trucks, I suspect yours is the same way. So, I take back what I said earlier. You could have a pinched brake line on the side that isn't over-applying. If you've inspected everything at the rear brakes on both sides and everything looks good and operates static, then I think you'll find you have a bad hydraulic control unit (HCU) or ABS Control Computer. Since it is a GM product I think this HCU high on the suspect list. I've seen quite a few of them fail. Good luck, Dusty
#9 of 449 Engine-Bearing Knock Noise by bassman May 04, 2004 (8:45 am)
I have developed a "bearing knock" when engine is cold. Noise goes away after warm up. These is a Tech. Service Bulleton on this problem. It is TSB #99-06-01-003 issued in April 1999. Does anyone have any information as to what the TSB says?
#10 of 449 In need of help on my 1990 by mcmike06 May 05, 2004 (5:19 pm)
Hey to everybody out there. I just recently (as in tonight) came across a problem with my 1990 Chevy C1500. This is what happened, I went outside to my truck & got in it started it up & moved it out of our driveway then I backed into our driveway except when i shut off the truck & got out my tail lights were still on. I have looked all around the truck for problems that I could see & I saw none. I was just wondering if anybody had any idea as to why they wont go off or what's causing this I would really be thankful for it. Replies to this message: higgy (Apr 17, 2005 4:25 pm) casper812 (Aug 01, 2006 6:26 pm) iplaybass (Dec 29, 2006 12:58 pm)