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Oct 06, 2009 (5:16 am)
My wife's 1999 Chevy Suburban has a intermittent soft pedal problem at slow speed, with the ABS shuttling at the same time. I recently replaced the master cylinder, bench bled it, and had the brake lines to each wheel bled. But all that work had no effect on the problem, it is getting worse. The brake shop that did the bleed said I need to have the dealer scan for codes at the ABS module. He said something about the ABS system getting stuck in dump mode, which would give a soft pedal and the shuttling behavior. I need to get this fixed, my wife does not want to drive it in this condition. Any ideas on how to diagnose? Thanks.
#501 of 607 Re: 2007 Suburban brake problem [kiawah]
Oct 06, 2009 (7:05 am)
Thanks for the suggestion. I thought about that, but since both the original AND the aftermarket brakes were too tight, I would have to do that everytime I put new brake pads on the car. So I spent a couple of hours and carefully filed a couple thousands of an inch off the caliper support brackets and they now work beautifully. I don't know if these parts slipped through inspection by the manufacturer of the parts or if it's a design flaw. But I shouldn't have any problems from now on. I think it's outrageous that I should have to do this to a new $47K vehicle.
The brakes on the left front had gotten so hot from dragging that they cooked the rubber seals on the dual piston caliper. Neither of the GM Mr. Goodwrench mechanics noticed that even after I asked them to check it.
#502 of 607 Re: ABS soft pedal [blackpacific1]
Oct 13, 2009 (8:51 am)
Just to set the record straight. I fixed this problem, but it was not the wheel speed sensor getting rusted up. It was a bad wheel hub bearing. The symptoms were: soft brake pedal and ABS shuttling at low speed stops, a driveshaft-like vibration at highway speeds, a popping sound on hard left turns from a stop, and variations in power steering authority in hairpin turns.
I have to thank the local Chevy dealer service guy who told me that the salt belt rusted wheel speed sensor environment problem did not apply to my year (1999) Suburban. He suggested that I first jack the front end off the ground and wiggle the tires. The passenger side tire had no give when shaken in the 12 and 6 o'clock positions. It had some give in the 9 and 3 o'clock positions, which could be attributed to steering linkage. But when I shook the driver's side tire, it did this; clunk-clunk, clunk-clunk in the 12 and 6 o'clock positions. Obviously a bad spindle bearing.
It cost me about $175 to fix, but it was relatively easy. Loosen the hub nut and lugnuts, then jack the front end off the ground, remove wheel, depress brake caliper and disconnect caliper bolts, move caliper out of the way, remove the three hub bolts with an impact wrench, disconnect the wheel speed sensor electrical connector, install new hub with the three bolts, wheel speed connector, caliper, etc....The three hub bolts did not want to come out. I hit all three with an impact wrench and 100psi, but only one came loose. I had my daughter pray while I torqued the two remaining with a breaker bar. Thankfully they backed out without stripping or snapping.
Nov 13, 2009 (8:28 pm)
I am about to purhcase a used Sub. 07/08. Because I am looking at ones with a lot of options I am having to look at one with higher miles say in the 40-50K range.
If these vehicles have been maintained is there any call for concern with reliability? The units that I have driven with those miles seem very solid compared to like competition.
Thanks for any input
#504 of 607 squeaky brakes 2008 suburban
Nov 23, 2009 (3:55 pm)
I have a question about my 2008 Suburban. Bought it used with 32000 miles on it. Anytime I gently presss the brake pedal I get a squeking noise, but as I press the pedal harder to actually stop the truck the squeak goes away. Called dealeship and they said it was just brake just and to go wash the discs off at a carwash. Didn't quite solve the problem. Thoughts. Anyone had this issue. Brakes work fine in terms fo slowing down truck and no wobbling in the steering wheel when brakes are applied.
#505 of 607 2003 5.3 burb fuel pressure issue low when parked
Nov 23, 2009 (5:01 pm)
My burb stalled while driving around 35mph, would not start back up. Had about 2 bars on the gas gauge or 51 miles to empty. Check the fuel pressure at the sch valve and nothing. Towed to friends shop, checked pressure at valve by pressing center of valve and nothing, even when turning on the key.
A day later after towing to another location, by buddy unplugged the regulator and plugged back in and he put the fuel pressure gauge and while he started it he noticed the fuel pressure getting stronger after each turn of the key, when the pressure got back up, everything started working. 2 days later all is well, runs normal.
I replace the fuel filter also.
Now the fuel psi is great while running, but when I turn it off it looses about 10 psi in about 10 minutes but starts back up.
I did not want to replace the fuel pump just yet, 77000 miles.
Also, when it stopped it was showing 51 miles to go on the digital gas gauge, so it was almost empty, I did about a gallon in and it did not help.
But now it's fine, any thoughts?
#506 of 607 Re: 2003 5.3 burb fuel pressure issue low when parked [ski1535]
by MrShift@Edmunds HOST
Nov 23, 2009 (5:24 pm)
Sounds like a defective fuel pressure regulator.
About $100 bucks in parts an .5 of an hour labor.
#507 of 607 Re: 2003 5.3 burb fuel pressure issue low when parked [Mr_Shiftright]
Nov 23, 2009 (7:27 pm)
Is there a way to test the regulator? But, it's been 3 days and still running like a champ, no issues at all.
#508 of 607 Re: squeaky brakes 2008 suburban [trucklover4]
Nov 24, 2009 (5:19 am)
As long as you checked to make sure the pads are not worn out, it's really nothing to worry about. Squeaking can be caused by dirt or rust trapped between the pads and rotor and the squeaking may come and go on ANY car or truck. Nothing to worry about but it is annoying.
#509 of 607 Surburban 2001 Preventative Maintenance
Nov 24, 2009 (7:29 am)
I have a question regarding my maintenance schedule for my 2001 Suburban. Can you help?
Our Chevy Suburban 2001, 1500 (4) wheel drive has 92,000 miles. Our last preventive maintenance (major) was at 5/5/2006, (66,500 miles) which included Transmission and Differential major preventative service. The scheduled service manual state the service for this preventive maintenance is every 50,000. The truck is currently consumed 50% of that time for these services.
Question: Is it your recommendation to wait another 2.5 years assuming we are driving the truck 10,000 miles per year?
Thank you for your help,