ABS locking up...

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tsemi - 26 Nov 2004 18:38 GMT

I have a 1994 s10 pickup with 4 wheel ABS that are locking up with
moderate pressure..Will after market 16" wheels make my abs brakes act
up?..I have new rotors/drums and pads that made no
difference..TIA..Jimmy

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Sarge - 26 Nov 2004 19:44 GMT

<tsemi> wrote in message "I have a 1994 s10 pickup with 4 wheel ABS that are
locking up with moderate pressure..Will after market 16" wheels make my abs
brakes act up?..I have new rotors/drums and pads that made no
difference..TIA..Jimmy"

Have you try changing the ABS parts. Shoes, pads, drums and rotor will not
stop your problem. There are 5 parets that go to the ABS system.
ABS PRESSURE LIMIT/ DUMP VALVE part number 15661378
ABS SPEED SENSOR
part numbers 4WD, Left 15727018
4WD, Right15727017
RWD, Left15725355
RWD, Right157253.
DCMB SIGNAL RELAY part number 25097359
ELECTRO-HYDRAULIC &/OR CONTROL MODULE part number check with
local GM dealer
PRESSURE MODULATION ABS VALVE
Eng VIN W12547215
Eng VIN Z,Automatic Trans12547215
Eng VIN Z,Standard Trans12384819

Sarge

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Whitelightning - 26 Nov 2004 21:27 GMT

> <tsemi> wrote in message "I have a 1994 s10 pickup with 4 wheel ABS that are
> locking up with moderate pressure..Will after market 16" wheels make my abs
[quoted text clipped - 16 lines]
> Eng VIN Z,Automatic Trans12547215
> Eng VIN Z,Standard Trans12384819

The problem is the speed sensor info is not matching what the abs computer
programming expects when compared with the vehicle speed reading from the
computer. It may be possible to flash the abs computer and solve the
problem. This was something we used to have to send customers to dealer
ship for when they went to tall tires on 4x4s.
Whitelightning

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Jay - 26 Nov 2004 23:26 GMT

Whitelightning has it exactly correct! That is the problem with your truck.
However, there are no 16 inch specs for a reflash on your abs that I know
of.

Signature

Jason E.
ASE Master Technician with L1 Advanced engine performance
GM Master Certified Technician

>> <tsemi> wrote in message "I have a 1994 s10 pickup with 4 wheel ABS that
> are
[quoted text clipped - 27 lines]
> ship for when they went to tall tires on 4x4s.
> Whitelightning

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tsemi - 26 Nov 2004 23:46 GMT

>> <tsemi> wrote in message "I have a 1994 s10 pickup with 4 wheel ABS that
>are
[quoted text clipped - 27 lines]
>ship for when they went to tall tires on 4x4s.
>Whitelightning

Hay Whitelighting, I believe I read recently that going to larger
tires will upset the abs computer..but the computer can be
re-programed..ABS brakes are a bit over my head, I do believe this is
a job for the dealer.........where is that vaseline?

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