 Brake warning light won't go out |
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| jmargush |
 Jun 3 2013, 03:33 PM
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#1
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Member  Group: Members Posts: 458 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176  |
After the last autox as I was pulling out of the lot I noticed the brake warning light was on. I pushed the reset and it didn't turn it off.
The pedal did have act like the master cylinder was going bad or had gotten air in the system. If I pumped the pedal it would gain some pressure. Drove it home and the light had gone out at one point, but came back on. Spent Saturday bleeding the brakes and pulled pan off below the MC to make sure I was getting the switch reset. Pedal travel is not as firm as I would like it to be. Light will not go out even when I know the reset is pushed in. Tried switch from another MC same thing. Is the MC bad and preventing the light from going out? Or something else? |
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| TheCabinetmaker |
Jun 3 2013, 03:37 PM
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#2
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
E brake is on or switch is stuck ?
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| jmargush |
Jun 3 2013, 04:47 PM
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#3
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Member Group: Members Posts: 458 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
I don't have a ebrake switch or at least it isn't in place and hasn't been for years.
What color wires go to the switch and where do they come from, out the back of the tunnel? Also does anybody have a picture of what color wires go where under the passenger seat? |
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| toolguy |
Jun 3 2013, 05:25 PM
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#4
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Senior Member Group: Members Posts: 1,267 Joined: 2-April 11 From: San Diego / El Cajon Member No.: 12,889 Region Association: Southern California 
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The E brake wire is Brown with a white trace. . the same lead goes to the Master Cylinder. . if either lead is lose and touching ground, the red warning light will be on. The E brake lead is usually run in the little square frame at the front of the seat. . If you pull the carpet back by the heater lever you should see it where it exits the main wire harness.
Pull the lead off the M/c and see if the light goes out to eliminate the M/C switch. . If the light stays on, the ground is elsewhere. Since the trouble occurred after a slalom, I'd bet a lose lead got tossed around and is touching frame ground |
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| injunmort |
Jun 3 2013, 06:59 PM
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#5
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Senior Member Group: Members Posts: 1,024 Joined: 12-April 10 From: sugarloaf ny Member No.: 11,604 Region Association: North East States |
seal on mc piston is leaking, rebuild mc. fwiw
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| jmargush |
Jun 3 2013, 07:02 PM
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#6
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Member Group: Members Posts: 458 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
that is what I am starting to think cause the light was out the next time I went out to the garage.
Are there rebuild kits still avail. or just by a rebuilt one? |
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| Dave_Darling |
Jun 3 2013, 08:10 PM
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#7
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914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Buy a reman one. Not worth the bother to rebuild it yourself, IMHO.
--DD |
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| Eric_Shea |
Jun 3 2013, 10:21 PM
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#8
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PMB Performance Group: Admin Posts: 19,274 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
No such thing as rebuilding MC's anymore. Kits are NLA. Probably a ground.
Remove your drivers seat and you'll probably see that brown and white wire snaking across the floor from the switch area to the back of your tunnel where it enters the main loom. |
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| jmargush |
Jun 4 2013, 07:59 PM
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#9
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Member Group: Members Posts: 458 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
How is the warning switch triggered? by excessive movement of the piston? As it goes too far in the cylinder it touches the plunger and pops it out?
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| Dave_Darling |
Jun 4 2013, 08:47 PM
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#10
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914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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There are two circuits in the brake system, and basically two master cylinders inside that one housing. There is a passage connecting the two, and a plunger inside that passage. If it moves too far to one side or the other, it closes the switch.
--DD |
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