I have a 1982 chevy 4x4 half ton got wiring issues with turn lights turn lights on they quit or u push on brake pedal they stop

brake light switch out of adjustment

abs activating . test abs speed sensors and wiring.

If you're not losing any brake fluid then it sounds to me as though the master cylinder is bleeding fluid between to two chambers allowing fluid to pass from one to the other which would decrease the pressure on one of the lines leading to the proportioning valve, thus setting off the 'brake' light.

Orrrrr,

IF it does NOT have the hydroboost system the following steps MAY help diagnose if it's a booster problem.

(Copied and pasted from a youtube comment)

Test 1) 1. Start the car 2. Let it idle for 2 minutes 3. After 2 minutes turn off the car 4. Pump the brake pedal 3 times 5. The pedal should rise every time if it does then the Booster and Check valve are OK 6. If the pedal doesn't then the is an issue with the either one, run tests 1 and 2.

Test 2) 1. Start the car 2. Let it idle for 2 Minutes 3. After 2 minutes push down the brake pedal and HOLD it 4. While holding the pedal down turn off the car 5. The pedal should NOT rise for at least 30 seconds 6. If it doesn't rise then the Check Valve is good 7. If the pedal rises before 30 seconds then the Check Valve is faulty.

Test 3) 1. Shut off the Engine 2. Pump the brake pedal 4 times 3. On the 4th one keep it pushed down and start the car while holding the pedal down 4. The pedal should sink down. 5. If it sinks, the booster is Fine.

Myself, I'm leaning towards the master cylinder having an internal 'leak' or bypass problem.

Hope this helps.

Should be on brake pedal under dash, could be brake switch is sticking or bad try pulling up on your brake pedal, if tail lights go off that's what it is, if not your switch is staying stuck in.

check for power at the wires going intop the tail lights, real common that the circuit board is bad, but unlikely both at the same time. The tag, tail lights and brakes are 2 different systems. Do the turn signals work normally? if so the wiring from the turn signal switch to the brake lights is GOOD. the stop light switch had\s a ORANGE wire that should have 12V if not ck STOP LPS fuse, when brake pedal is depressed, the WHITE wire is 12V (at the stop light switch) if that is OK, the turn signal switch COULD be bad. The wiring harness plug is near the back left under the tailgate, see if that is disconnected?

You will need to replace the Brake Light switch which is located on your Brake Pedal.

your power starts at the brake light fuse,check with a test light,then proceed to stop light switch on brake pedal under dash,one wire will be hot when when you check it with your test light, the other won't be until you press down the brake pedal then the power flows through to the second wire,if no power to second wire replace switch,if you have power remove tail light bulbs and check for power in side socket.

have you replaced the bulbs?

check for a defective tail light,or rear socket light,circuit wiring touching each other at trailer plug if equip.usually damaged wiring are at rear of truck,unless wiring mod.were done under dash!

from what i remember the overdrive is electronically activated. it is disengaged by low rpm or a switch on the brake pedal. check the pedal switch and look to see if there is a disconnected wire near transmission.hope this helps. please rate me