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Old 10-17-2018, 06:41 AM   #1
Packard
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Default Do rear brakes engage in park on abs vehicle?

Do rear brakes engage in park on abs vehicle ? I tried by spinning the tire and I had no resistance. .

This car is abs but I want to see if my rears are on . If Im driving over 8mph I have abs and brake light.
I wanted to know if I should still get rear and front brakes work?

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Old 10-17-2018, 08:14 AM   #2
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Default Re: Do rear brakes engage in park on abs vehicle?

No brakes engage when you just put the automatic transmission selector in PARK. PARK only engages a 'pawl' to lock the transmission and on FWD cars this means the front axles are locked. Nothing about brakes whether ABS or not. Since there is no drive axle to the rear, those rear wheels will of course spin freely if jacked up.
But your are saying that if driving 8mpg forward, the brake light is on? meaning that you have the E-brake lever pulled up? If so, then yes, your rear brakes should be braking, but that has nothing to do with ABS, just a mechanical lever pulling on the rear brake cable and tightening the shoes against the drums.

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Old 10-17-2018, 08:16 AM   #3
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Default Re: Do rear brakes engage in park on abs vehicle?

I have the understanding that selecting Park in an automatic transmission locks up the transmission which means the front wheels won't turn. The rear wheels will turn as there is no linkage to the transmission.

The parking brake locks the rear wheels via the parking brake cable. The parking brake has no connection to the front wheels. The parking brake is mechanical not hydraulic so it has no relationship to ABS.

This is the same for an ABS and non-ABS vehicle in general.

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Old 10-17-2018, 12:22 PM   #4
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Default Re: Do rear brakes engage in park on abs vehicle?

One more wrinkle to this:

If you jack up both front wheels, P (or any gear with a manual) will not prevent the wheels from spinning, but spinning one will force the other to turn in the opposite direction.

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Old 10-17-2018, 03:28 PM   #5
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Default Re: Do rear brakes engage in park on abs vehicle?

You're describing two problems. Each problem is addressed separately. No interaction occurs between parking brake application and abs.

1-ABS failed to operate hence the abs light. ABS works using the hydraulic brake system. ABS fails in one of several ways; internal power-up self testing reveals electronic issues, one or more wheel speed sensor failure, damage to one or more reluctor rings, damage to one or more wiring harnesses to each wheel speed sensor.

2-Park brakes - pulling the park brake lever engages rear brakes by cables and cam/lever action in either drums or calipers. The parking brakes aren't working and due to; broken cables, park brake mechanism missing/not adjusted, rear brakes not adjusted, etc.. Parking brakes work by pulling cables operating each brake (drum or caliper) to force brake shoes or pads against drums or rotor to prevent car movement.

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Old 10-18-2018, 12:44 AM   #6
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Default Re: Do rear brakes engage in park on abs vehicle?

Im not concerned parking brake. I know how a parking brake light works.

Quote:
Originally Posted by fdryer View Post
When misinformed and trying to find correct info, you're likely to find the wrong info attempting to adapt from posts not pertaining to your specific model year.

1-Your ABS activated and is not 'homing' at all. It's activating because its receiving incorrect wheel speed sensor information. You're being swayed by procedures that are confusing and missing the error - ABS activation. Flushing or bleeding brake lines will not correct a problem with the ABS system.

The normal sequence for ABS system self checks occurs from ignition ON time when the ABS light cycled on and off to inform the driver that initial ABS self tests (electronics) have passed otherwise the ABS light will remain ON. When driving off, ABS initializes itself by monitoring wheel speed sensors and activating its motor to continue self tests and if all goes well all you hear is a momentary 'zinging' sound. Zinging occurs around 5-10 mph. ABS always starts from all its valves closed whether or not failure occurred (ABS light staying ON ) to stay invisible to the main braking system so it can never interfere with braking if it fails. When an emergency or uneven surface presents itself during hard braking requiring ABS operation, the 'foot massage' indicates ABS is operating to prevent any wheel from locking up. ABS relies on a driver to step on the brake pedal HARD.

Only one member had a failed ABS unit that left him without rear brakes and it wasn't an '02. His ABS unit is an older type that failed in the open valve or 'not homed' position. His is the only reported incident of finding ABS in a rare position where one or more valves were left open.

Your ABS is activating from an error; wiring to sensors, faulty wheel speed sensor, broken reluctor.

2-All flushing/bleeding procedures are done with the engine OFF. Never perform fluid replacement with the engine running. The correct flushing/bleeding procedures with dual diagonal brakes life your Saturn is RR/LF, LR/RF.

You are dealing with two (2) separate issues, not one. An ABS and brake bleeding problem. Brake bleeding is the easier of the two to resolve with correct procedures. ABS troubleshooting is not friendly if not familiar with ABS operation.

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Old 10-18-2018, 01:03 AM   #7
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Default Re: Do rear brakes engage in park on abs vehicle?

First test my car pass the key on to engine run 3sec abs and brake go off when car running


Ive taken a digital speedometer and measured speeds of 5mph I have a abs and brake light sometimes . Sometime it dont come on for little but when they come on there both solid.

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Old 10-18-2018, 08:06 AM   #8
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Default Re: Do rear brakes engage in park on abs vehicle?

I believe the startup test you're describing is only a bulb check, not an actual ABS check. The actual ABS check comes at 5mph.

You can either blindly test things such as the wheel speed sensor resistances, check for gunk in the front reluctor rings, check wheel bearings (had a '93 with a bad wheel bearing and the only symptom I could feel/see was the ABS light) or track down someone with a Tech II to get the codes read and know where it thinks the problem lies. VXDiag VCX Nano is supposed to be a cheap alternative, if you have a laptop.

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