Jump to content

Abs problems

Brutus93

Recommended Posts

Brutus93 New Member

Brutus93

Posted
Posted

Does my 93 k1500 suburban 4x4 abs system use a fuse or a relay. My brakes went out, and a coworker suggested replacing the abs fuse/relay(whichever the case me be) before replacing the booster. The abs light has been on since I bought the truck in 2010. I didn't think anything about it,but recently it has been using fluid but there is no evidence to explain where the fluid is going. And really recently the brakes have been spongy and today the abs light went off and the brakes failed and now won't work at all. Any ideas?

ifixedit Enthusiast

ifixedit

Posted
Posted

Crawl under the truck and look at the drivers side bottom of the frame for an area wet with brake fluid, I'll about guarantee you've got a rusty brake line that is now leaking. These years are notorious for the lines rusting out. The ABS uses a large fuse located under the hood in the black box with the cover on it, I believe it's a yellow 60 amp. If the brake line is leaking most likely both the brake light and ABS will be lit up.

  • 2 weeks later...
  • 2 weeks later...
Duelin Enthusiast

Duelin

Posted
Posted

Also could be master cylinder leaking back into the booster. The way that I check a master cylinder. I have some plugs that I made up. I remove the brake lines from the master cylinder and screw the plugs in. If the master is leaking past the seals you will lose the pedal. If it holds then it is not the master. Then I will replace one line at a time and test for a pedal. The line that you loose the pedal on will be the section that you start to inspect for leaks. But this method is not necessary if you have an obvious leak.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • newdude
      2020 Trailboss 6.2 replacement

      By newdude · Posted

      Correct.  2019-2021 model years are serviced by a different p/n.  19420611.  Recall 2021s use 19420611.   The recall engines 2022-2024 model years are serviced with 12740076.     The difference between 19420611 and 12740076 is GM changed injector size for 2022.  The injectors are smaller on 12740076 with smaller injector bores in the cylinder heads to match the smaller injectors.  So you can't install a 19420611 in a 2022-2024, and you can't install a 12740076 in a 2019-2021.     Both engines are the replacement engine p/ns that are in the L87 recall.  So both of these are the updated engines.     Here's a version of the L87 recall with the p/ns for all the parts needed.    RCRIT-25V274-7075.pdf   Note it shows 19420611 and 12740076 with an asterisk to a footnote "Use the VIN and the GM Electronic Parts Catalog (EPC) to determine which part to order if two or more part numbers are listed for the same part, as it may vary by vehicle options."    
    • 2017Z
      2020 Trailboss 6.2 replacement

      By 2017Z · Posted

      Looking for advice from this group. Took my flawless 2020 6.2 TB to an unnamed shop for routine rear brakes and oil change. Tech forgot to put oil back in after the full service and needles to say, destroyed my engine.  It’s all on their shop video so they are responsible.   I had my Chevy dealer do the analysis and they confirmed its compromised and said engine replacement. The manager said they only get GM reman engines from GM with full 3 yr warranty and the one they would put in is not same as what’s they are swapping out on 21-25 for recall.    I am looking for advice why that would be a different engine because obviously I had the good 6.2 year and replacing it has my concerns with that recall for 21-15   Also what’s the pros and cons of accepting the engine swap vs telling the shop that bricked the truck to pay up so I buy a new truck. I’m concerned about stigma resale eventually if I just decide to get rid of it after the swap or other issues showing up after the swap out.  
    • GN2018
      AFM Disabler Question

      By GN2018 · Posted

      Just looked up my records.  I've never gone over 5000 miles between oil changes.  At 46K miles, I have 10 oil changes.  I hope that will help.  I also installed the disabler last year.  I've still had a few times when it didn't seem to engage (which I can tell because the start stop feature kicks in), but for the most part, I think it's working.  For some reason, GM did not include the number of cylinders running in the information screen like I had on other models.  In my Cadillac, it shows me when it's running on 4 cylinders on the fuel milage screen.  I can't find that on my '21 Denali.
    • davester
      Wiring Help, Please

      By davester · Posted

      you might read through the info on gmupfitter.com for your truck, to find a good power source.
    • Grumpy Bear
      AFM Disabler Question

      By Grumpy Bear · Posted

      Melling I believe is/was the OEM on the lifters who explored this problem some years ago. The white paper they generated on the topic indicated two items of note when I read it. 1.) They only fail on the switch. Prevent the switch, prevent the failure. 2.) The majority fail due to deposits messing up the timing of that switch. Anyway that's what I got from it.    Mine have always been active, 195K+ now, and my oil maintenance is surgically clean.    Of course this assumes good parts. That is no heat treat issue or machining flaws. I get comfortable that these issues are in the rearview mirror by about 30K. IMHO naturally. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...