I'm having a problem with my brakes, replace.

Tiny
WITTLECHIC
  • 1996 GMC SAVANA
  • 75,000 MILES

I'm having a problem with my brakes, replace all the lines and the master, bleed the master but I still dont have a brake peddle what else can be done. Please help me

Yvonne

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Sunday, November 25th, 2012 AT 6:28 PM

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Tiny
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I can't see much from here. Any abs codes/ antilock brakes. Did you follow proper bleeding procedure?

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Sunday, November 25th, 2012 AT 6:42 PM
Tiny
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No codes/ or antilock brakes codes, I just dont have a peddle and yes I followed bleeding procedures, I need help

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Sunday, November 25th, 2012 AT 9:11 PM
Tiny
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Can you get any fluid at the wheel cylinders?

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Monday, November 26th, 2012 AT 1:26 PM
Tiny
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Were you having this problem before you worked on it? With vehicle moving slowly will the brakes stop the vehicle? What about your brake booster?

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Monday, November 26th, 2012 AT 1:44 PM
Tiny
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I had brakes before the line broke, so I replace all lines then I replaced the master but I have a peddle when the car is off but when I start it up I have no pedal? Anything you can think of what might cause it to do this would greatly help me.

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Monday, November 26th, 2012 AT 3:34 PM
Tiny
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Hi, I asked the boss to have one of the others check out your post. I've gone about as far as I can. I'm not sure how long it will take to get a reply.

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Monday, November 26th, 2012 AT 4:34 PM
Tiny
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Ok I wait got your boss to reply, thank you so much for your help JDL, I sure hope he can help me fix the problem

Thank you
Yvonne

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Monday, November 26th, 2012 AT 7:33 PM
Tiny
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Ok I wait got your boss to reply, thank you so much for your help JDL, I sure hope he can help me fix the problem

Thank you
Wittlechic

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Monday, November 26th, 2012 AT 7:34 PM
Tiny
HMAC300
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Hi checking into this a few questions. When you first installed the master cylinder did you bench bleed it before install? Is this the correct master like if it's for a vacuum booster and you have ahydro boost the may be different with different lengths of rod. If you bled this correctly, meaning rr-lr-rf-lf it should be ok unless the rod is to short. If this is hydro boost then you may still have air in system. If this is a vacuum booster then seeif the check valve at booster is leaking.

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Monday, November 26th, 2012 AT 8:09 PM
Tiny
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Oneother thing, if this is hydro boost check for full p/s resevoir then do this:
BLEEDING HYDRO BOOST SYSTEM

1. Fill power steering pump reservoir and leave undisturbed for at least 2 minutes. Start engine and run momentarily. Add fluid if necessary. Repeat until fluid level remains constant with engine running.
2. Stop engine. Raise front wheels off the ground. Turn steering wheel from stop to stop. Add fluid if necessary. Lower vehicle.
3. Start engine. Press brake pedal several times while turning steering wheel from stop to stop. Turn engine off. Press brake pedal several times to exhaust accumulator pressure. Check fluid level. Add fluid (if
necessary).
4. If fluid is foamy, let vehicle stand for several minutes, then repeat step 3). Air in system will cause fluid level to rise with engine off. Continue to bleed system until all air is expelled. If all air is not expelled after
bleeding system, check power steering system for problem.

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Monday, November 26th, 2012 AT 8:15 PM
Tiny
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Yes I bled the master Bled all lines just in the way you describe, I had brakes before but then one of the line broke so I decided to replace them all that's where the problem started. So then I replace the master twice cause I thought the first one was bad, but when the van not running I have brakes, the minute I start it up the pedal goes to the floor.? I don't know what else to do, somebody help me

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Monday, November 26th, 2012 AT 9:22 PM
Tiny
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Re read what I sent in my first two replies as i'm not getting the info I need. Also do what I am sending to the anti lock unit, I think that is where your problem lies. Make sure you do this correctly then rebleed your whole system once more. I STRONGLY SUGGEST that you get a POWER bleeder to do this, autp partsstores may have them ifnot rental shops do. If this step fails then you will have to take it to a dealer to get codes from teh ABS unit and it will need to be fixed with a tech 1 and appropriate cartridge.

BRAKE PRESSURE MODULATOR VALVE

NOTE: It is not necessary to bleed BPMV during normal brake system bleeding. If BPMV is replaced or is suspected to have air in it, BPMV must be bled. Expect to use
2 3 quarts of fluid to thoroughly bleed system. Bleeding BPMV requires Tech 1 scan tool and appropriate cartridge.

Manual Bleeding

1. Raise and support vehicle. Begin by bleeding the right rear wheel, then the left rear, right front and left front. Attach one end of clear tube over valve and submerge other end in container partially filled with clean
brake fluid.
2. Loosen bleeder valve 1/2 1 turn. Have an assistant depress brake pedal slowly and hold. Tighten bleeder valve and slowly release brake pedal. Wait 10 15 seconds. Repeat sequence, including 15 second wait,
until one pint of fluid has been bled from wheel.
3. Remove tube and wrench. Repeat step 2) at left rear, right front, and left front wheels in this order. Clean brake fluid should be present at each wheel bleed screw. Check master cylinder fluid level every 4 6
strokes of brake pedal to avoid ingesting air into system.
4. If any component was replaced causing air to enter the BPMV, connect Tech 1 scan tool with RWAL/4WAL cartridge or Mass Storage Cartridge to Data Link Connector (DLC). Using Tech 1 scan tool,
perform 4 functional tests while firmly applying brake pedal.
5. Fill master cylinder reservoir, and install cover. Ensure there is no sponginess in brake pedal and that BRAKE warning light is off. Rebleed wheel cylinders/calipers to remove the remaining air in brake system.
Evaluate brake pedal feel and braking performance. Repeat bleeding procedure if necessary.

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Monday, November 26th, 2012 AT 11:29 PM
Tiny
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Yes I bleed the master, then bleed all the lines about 6/8 times, I have a break only when the car is off but the minute I turn it on the pedal goes to the floor

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Tuesday, November 27th, 2012 AT 1:50 AM
Tiny
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Thanks hmac300. Jd

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Tuesday, November 27th, 2012 AT 1:55 PM
Tiny
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You kep giving me the same answer for everything that I have posted I suggest you take this to adealer where they can bleed it properly as your mistake has been to remove all the lines probably screwing up the brake modulator valve in the abs unit which now REQUIRESS a tech ! And cartridge being used to get it to bleed out correctly. Weh ave have tried to explain to you but you just keep sending the same lame answer to everything that has been suggested. I really think this si beyond your capability.

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Tuesday, November 27th, 2012 AT 3:32 PM

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