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02-23-2018, 02:10 AM | #1 |
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Join Date: Jul 2011
Location: El Campo, Tx
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97 GMC 1500 can’t get brakes bled
Trying to bleed brakes after changing brake hose and cannot get the large bubbles to stop or a meaningful amount of fluid to come through hose in a reasonable time. Tried to do with mityvac which I understand might not be best option. Depressed the button on abs module and has good oil flow from it when pedal is depressed. Do not have the abs scan tool. Tried driving it and locking up wheels, didn’t help. What do I do next?
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02-23-2018, 05:20 AM | #2 |
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Location: Yucaipa, Calif.
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Re: 97 GMC 1500 can’t get brakes bled
There's a $20 tool you need that clips on the valve at the bottom of this pic I posted. You can then bleed the brakes like normal. It's what I had to do when I replaced the MC and reflared and refitted some of the brake lines on this K2500 I'm working on.
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1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C |
03-01-2018, 11:34 AM | #3 |
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Location: Smithfield, VA
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Re: 97 GMC 1500 can’t get brakes bled
Changed a few master cylinders on my truck AND brake lines and never needed any special tools.
I had tried a mity vac in the past and it was terrible because it drew air from around the brake bleeder screw. The only method I use now is put a tight fitting hose on the bleeder screw and immerse it in a clear bottle of brake fluid. You can then open the bleeder and pump the brake pedal till you get either clean fluid or no more bubbles then close the bleeder. As long as the hose stays in the fluid, you will not get air in the system. Save the mity-vac for other jobs, this isn't one of them. Oh and if you want better brakes, change your MC if it looks like the one in the photo above. Last edited by speedygonzales; 03-01-2018 at 05:26 PM. |
03-01-2018, 03:54 PM | #4 |
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Location: Beaverton, OR from WA State
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Re: 97 GMC 1500 can’t get brakes bled
The '97 will require a bi-directional scan tool to properly cycle the ABS unit and fully bleed the brakes.
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
03-01-2018, 04:23 PM | #5 |
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Join Date: Dec 1999
Location: Mesa AZ
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Re: 97 GMC 1500 can’t get brakes bled
I've replaced the master cylinder with a stock and now a NBS version, all 4 brake calipers [disk rears] along with wheel cylinders back when the rear was drum, and all the hoses with steel braided lines. I've never needed a special tool. I've never cycled the ABS pump either. Master cylinders do go bad on occasion remember.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
03-01-2018, 05:25 PM | #6 | |
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Location: Smithfield, VA
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Re: 97 GMC 1500 can’t get brakes bled
Quote:
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03-02-2018, 12:49 AM | #7 | ||
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Join Date: Sep 2009
Location: Beaverton, OR from WA State
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Re: 97 GMC 1500 can’t get brakes bled
Quote:
Quote:
See attached snip from Alldata.
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
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03-02-2018, 09:06 PM | #8 | |
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Join Date: Jan 2006
Location: Smithfield, VA
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Re: 97 GMC 1500 can’t get brakes bled
Quote:
I'm still going to look into cycling the ABS and bleeding it completely and see what happens. Stay tuned for an update when weather in SE VA permits. |
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03-05-2018, 06:42 PM | #9 |
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Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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Un freekin believable
OK so after having the truck since I bought it new in Dec 1998, With the persuasion of this post I did it. For the first time I did the "automatic brake bleed procedure" as listed on the menu of the Solus Pro.
Holy crap the brakes are back as good as new. I'll be posting elsewhere to let folks know. thanks to 83GMCK2500 and a guy on a GTO bulletin board to spark my curiosity. |
03-05-2018, 07:26 PM | #10 |
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Join Date: Sep 2009
Location: Beaverton, OR from WA State
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Re: 97 GMC 1500 can’t get brakes bled
Hallelujah! I'm very happy for you, congratulations in restoring your braking!
Regarding your question in previous post, I couldn't say...I recognize that a person would need a fairly detailed education in hydraulic systems for full analysis. The classes I've had only scratch the surface, enough for me to know that there is a lot left to learn. Without seeing a diagram that showed the various states each portion of the system is in when the brakes aren't applied, are applied, and with/without ABS cycling it'd only be a guess. My guess: when the pedal is applied and the abs system isn't directing a lock/unlock event the trapped air is compressing or allowing fluid to bypass the valves in the abs valve.
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 Last edited by 83GMCK2500; 03-05-2018 at 07:33 PM. |
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