1993 940 Lost brake booster power and lights

themtnman369 · Post by **themtnman369** » 24 Jul 2015, 13:48

Hi folks. Yesterday the booster power was lost to the brakes, and the brake lights went out. Have checked known fuses, including the 10 amp on the relay under the instrument panel. Hopefully a relay? Noticed no hissing from the booster. Please help! P.S. No ABS light, and no brake light coming on on the dash. Bulbs are good. ABS light does not come on at all with ignition, but bulb tests good. Just hard brakes, and no brake lights.

themtnman369 · Post by **themtnman369** » 26 Jul 2015, 15:39

I fixed it folks. To sum up, if the check valve on the booster becomes blocked, you not only lose power brakes, it affects the vacuum on the pedal switch, and you lose brake lights.