Need advice on brake light issue.
#1
Racer
Thread Starter
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'88 Carrera.
The brake lights only work intermittently, only when I push very hard on the pedal.
I replaced the circuit fuses and checked the fit on the 2 brake light switches. No change.
Can the fix be?: (1) The brake switches or hydraulic components of the switch sending units are bad. Can each separately or both of the 2 assemblies go bad? If the sending units are bad, is the hydraulic system opened (i.e. catch escaping fluid and bleed system)? (2) The brake pedal rod needs adjustment. There is about 1/2" of free play before resistance is felt. The light only comes on when the pedal is bottomed out hard, about 1-1/2" of travel. (3) The hydraulics need bleeding. The pedal pressure is not soft or spongy.
Thanks.
The brake lights only work intermittently, only when I push very hard on the pedal.
I replaced the circuit fuses and checked the fit on the 2 brake light switches. No change.
Can the fix be?: (1) The brake switches or hydraulic components of the switch sending units are bad. Can each separately or both of the 2 assemblies go bad? If the sending units are bad, is the hydraulic system opened (i.e. catch escaping fluid and bleed system)? (2) The brake pedal rod needs adjustment. There is about 1/2" of free play before resistance is felt. The light only comes on when the pedal is bottomed out hard, about 1-1/2" of travel. (3) The hydraulics need bleeding. The pedal pressure is not soft or spongy.
Thanks.
#2
Rennlist Member
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I'd say that unless you had the whole thing apart, the rod didn't fall out of adjustment. I'd replace the switches, they're pretty cheap and a known consumable, and easy enough to change.
#3
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IIRC, the switches are pressure activated. It is possible they are failing and showing the symptoms you mention. They should be replaced as a pair since they are wired in parallel.
#4
Racer
Thread Starter
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Is the failed part the white electronic component or the metallic part that fits into the side of the master cylinder? If it is the metallic part, will I have to re-bleed the system?
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#8
Burning Brakes
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Seldom do you have to bleed after replacement. Both have to be working correctly to carry the current. Replace them both. Use you catch rags, you will loose very little fluid. Thats how they act when one is acting up. Never seen anything "clogged" inside to cause it. But I'm sure it would if something was really in there. Probably not. Get the switches.