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Either the power brake booster is bad, or it don't have any vacuum going to it.
That is the part that the brake master cylinder is bolted to.
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∙ 15y ago
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How do you turn off brake light on 1978 Ford F150 4x4 pickup truck?
Check the operation and alignment of the brake light switch, located at the upper end of the brake pedal under the dash area
Where is the fuse box located in 1978 Chevrolet Pickup?
the fuse panel is located on the drivers side up under the dash almost directly behind the emergency brake pedal..
Why isn't the brake lights not working on a 1978 ford pick up truck?
First check the fuse. If it is good, look under the dash and find the brake light switch. It will be mounted on the brake pedal lever or may be mounted so the brake pedal lever contacts it. It is adjustable and may just need adjusting. It the adjustment is correct, then replace it.
Do you put brake fluid in both sides of master cylinder 1978 Chevy truck?
yes
Why does your brake lights on your 1978 mone Carlo not work all fuses are good and grond wire good taillights work?
try brake switch under pedal
Why does my 1978 ford f250 power brake pedal go to the floor sometimes. Fluid is up.?
Sounds like a master cylinder.
What did a Chevrolet LUV cost in 1978?
need to know what was the selling price of a 1976 chev luv truck brand new
How do you turn off brake warning light on Ford F150 pickup truck 1978?
Make sure brake fluid in the master cylinder is at the proper level Make sure parking brake is fully released and switch is working
What is the firing order on a 1978 Chevy truck 350?
All V8 Chevrolet's are 1,8,4,3,6,5,7,2 with 1,3,5,7 on the left bank and 2,4,6,8 on the right with the distributor rotating clockwise.
1978 corvette new brake system you have good pedal after bleeding system but pedal fades almost to floor when the car is running you tried bleeding the brakes while the engine was running and gravity?
I would suspect the Master Cylinder if defective. I had the same problem with my 1978. I replaced the combination valve and it solved the problem after bleeding.
Where on a 1978 Jeep CJ5 do the brakes trigger the brake lights to work when the problem is that the rear turn signals work but not the brake lights?
The switch is located at the top of the steering column near the brake pedal. There is a bracket attached to the brake pedal that contacts and opens the switch when the brake is not being applied. Push on the brake the switch closes, and the lights come on. Look up the switch on Autozone.com or equivalent to see what it looks like. It's very hard to spot where it's at. Good luck Answer i believe there is a switch on the brake pedal lever near the top. I will go look on my jeep when I go back outside. Also, the brake light circuit has its own fuse separate from the signal lights.
What is the firing order for your 1978 Chevy truck with a 350 engine?
All V8 Chevrolet's are 1,8,4,3,6,5,7,2 with 1,3,5,7 on the left bank and 2,4,6,8 on the right with the distributor rotating clockwise.
