These cars had issues with the pedal pressure sensor located in the brake booster. Additionally the brake booster it self is also known for failure on this car.
Dfyhhh
replace the burnt out bulb
There is a brake line vent tube on most Volvo trucks which allows excessive pressure to be released. This prevents catastrophic failure to the system.
Brake circuit failure. Normally this means the brake fluid level is too low.
If it says 'Brake Light Failure' or similar, your brake light is out. change the bulb.
Well, if the brake fluid is fine, yet there is a message saying "brake fluid" or "low brake fluid level", then there is a possibility that that the float sensor in the reservoir is faulty, the wiring leading to the sensor is faulty, or the computer is faulty.
It indicates there is a problem. Get it looked at immediatly. Brakes are nothing to play games with. Your life (and others) depends on them.
at the brake pedal behind or on top
My Chilton Volvo repair manual ( 1970 to 1983 ) shows ( DOT 4 brake fluid )
the check engine light goes on and all the other lights ABS, brake, trac keep coming on and going off
Could be the bearings.
Bulb warning failure relay, a big round and red relay, back the ashtray