Brake light keeps coming on, pedal drops a bit
#1
02-01-2019, 08:08 AM
Join Date: Jan 2019
Location: Oak Ridge, TN
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Brake light keeps coming on, pedal drops a bit
Well, my brake lights keep coming on and my brake pedal has some play up and down. I’m guessing that my master cylinder is starting to go. But isn’t there some return spring up there at the pedal pivot point?
I have only had it for about a month now and I’m still getting used to having manual brakes after about a twenty year hiatus from them. Still plenty of pedal feedback, but I’m taking this as a warning sign.
I have only had it for about a month now and I’m still getting used to having manual brakes after about a twenty year hiatus from them. Still plenty of pedal feedback, but I’m taking this as a warning sign.
#3
02-02-2019, 01:43 PM
#4
02-02-2019, 04:21 PM
If the brake light that keeps coming on...is on the dash, it's controlled by this: The Brake Pressure Differential Valve Warning Lamp Switch that threads into the Brake Pressure Differential Valve.
When the brake fluid in the master cylinders reservoir is low, this light comes on and stays on.
The switch is the same 1968/79 (C8AZ-2B264-A), but what year/series is the truck?
When the brake fluid in the master cylinders reservoir is low, this light comes on and stays on.
The switch is the same 1968/79 (C8AZ-2B264-A), but what year/series is the truck?
#5
02-03-2019, 07:44 AM
Join Date: Jan 2019
Location: Oak Ridge, TN
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If the brake light that keeps coming on...is on the dash, it's controlled by this: The Brake Pressure Differential Valve Warning Lamp Switch that threads into the Brake Pressure Differential Valve.
When the brake fluid in the master cylinders reservoir is low, this light comes on and stays on.
The switch is the same 1968/79 (C8AZ-2B264-A), but what year/series is the truck?
When the brake fluid in the master cylinders reservoir is low, this light comes on and stays on.
The switch is the same 1968/79 (C8AZ-2B264-A), but what year/series is the truck?
#6
02-03-2019, 11:59 AM
Brake (stop) lamp switch threads into an adapter that clips onto the brake pedal.
If the brake lights keep coming on, the switch is out of adjustment, or one or more of the prongs that retains the adapter to the pedal broke, a common occurrence.
"Newer" replacement switch uses nuts to retain it to the pedal, eliminating the pesky adapter.
#7
02-03-2019, 04:24 PM
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#8
03-06-2019, 02:19 PM
Same sort of thing was happening to me recently. I picked up up a new brake light switch, looks to be the same kind as the old one but the new switch has the nuts as NumberDummy mentioned. Fixed the problem, brakes actually turn off now when I let my foot off the brake.
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