12-17-2016, 09:05 PM
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#1
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Strange brake issue - hard pedal
I started having some issues with my brakes recently and am hoping someone on the forum can send me in the right direction.
What happens is that when I am driving, my brake pedal will feel stiff when I am trying to brake, and my braking power seems noticeably diminished. If l start pumping the brake, the pedal gets harder and the braking power seems to diminish with each additional brake pump until they are hard as a rock and don't seem to brake at all. The problem seems like it's worse when it's really cold, but that could be my imagination.
I took it in to a shop on Thursday and they thought it was the power brake booster, so they swapped out the booster and the master cylinder. When I went to pick it up, they kept stalling and delaying the pick up time and eventually gave it back to me saying that it still felt weird to them, but I could take it home for the weekend and see how it felt to me. Well, to me it feels exactly the same as when I first brought it in...
So what could be causing this problem?
The shop said they bled the brakes multiple times and put in new fluids. I think they said they checked the wheel bearings too. Rotors and calipers were replaced like a year in a half ago. Drums were serviced then too. As far as shops go, this place is pretty honest and I don't think they intentionally misled me, but I am certainly annoyed that we just replaced a bunch of stuff that didn't seem to fix the issue.
Hopefully someone has an idea of what else it could be.
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12-17-2016, 09:27 PM
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#2
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Did they replace the brake booster check valve as well?
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12-17-2016, 09:32 PM
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#3
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Yah, new check valve. That was the first thing we did.
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12-17-2016, 10:25 PM
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#4
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If the new booster (is it OEM) isn't bad make sure the vacuum line from the manifold to the booster is good.
If it is fine then take a look at the condition of the calipers.
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12-17-2016, 10:25 PM
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#5
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ABS work as well?
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12-17-2016, 10:33 PM
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#6
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Seems to kick in when I start to slide without any issue. I hear that nice pleasant sound... Is there anything else I should be doing to check the abs?
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12-18-2016, 12:39 PM
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#7
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There is an ABS diagnostic port on the driver's side of the intake manifold in order to check for codes. I have never done the check myself and can't off the top of my head remember the procedure. If you can hear it working I don't know if that is your problem.
If you can find access to an online factory service manual then it can show you how to check for codes.
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12-18-2016, 03:36 PM
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#8
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Quote:
Originally Posted by LittleCaesar
There is an ABS diagnostic port on the driver's side of the intake manifold in order to check for codes. I have never done the check myself and can't off the top of my head remember the procedure. If you can hear it working I don't know if that is your problem.
If you can find access to an online factory service manual then it can show you how to check for codes.
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If he doesn't have an ABS light, he doesn't have any codes.
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'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
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12-18-2016, 03:56 PM
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#9
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Quote:
Originally Posted by TheDurk
If he doesn't have an ABS light, he doesn't have any codes.
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Makes sense.. lol.
Any other ideas? I'm at a loss.
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12-18-2016, 04:09 PM
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#10
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At a loss as well. Ask the mechanic to install another brake booster or find a used working OEM one.
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12-18-2016, 05:37 PM
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#11
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Quote:
Originally Posted by Renton4runner
Makes sense.. lol.
Any other ideas? I'm at a loss.
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Can't really think about the question without knowing the year. Very different systems.
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'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
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12-18-2016, 05:40 PM
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#12
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1998 sr5 v6 5 SPD.
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12-18-2016, 05:43 PM
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#13
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This issue seemed to come up after I went off roading in some deep snow(2+ feet), but that could just be a coincidence.
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12-19-2016, 11:55 AM
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#14
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Tested it some more today. Breaks feel generally weak when I start the car in the morning, but felt a bit better after about 20 minutes. They symptom of losing my breaks entirely after pumping them 5 or 6 times is always there though. After the 5th or 6th pump the break pedal is hard as a rock and doesn't seem to provide any breaking power.
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12-19-2016, 12:08 PM
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#15
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Quote:
Originally Posted by Renton4runner
Tested it some more today. Breaks feel generally weak when I start the car in the morning, but felt a bit better after about 20 minutes. They symptom of losing my breaks entirely after pumping them 5 or 6 times is always there though. After the 5th or 6th pump the break pedal is hard as a rock and doesn't seem to provide any breaking power.
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Is this not normal? Every vehicle I've ever driven loses brake power when you're stepping on them that many times.
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