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The 1991 Volvo brake light relay switch is located beneath the drivers side dashboard. The brake light relay switch will be above the brake pedal.
On the top of the back window position in the middle .
Above your left Knee when you are driving
the fuses which opperate the brake lights are located in the fuse box in the engine compartment. the relays are to the left of the clutch in a white connection cluster.
Check your owner manual under fuses / relays. If you do not have one check Related Links below.
check the switch at the top of the brake peddle.
It will automatically go off when all the brake lights are in working order. Don't overlook the center brake light. :)
The brake light switch is located on a bracket behind the brake pedal support.
There is no relay in the brake light circuit. There is a fuse . The only way they turn on and off is by the brake light switch that is located above the brake pedal on the steering column. There are 2 relays built into the under hood fuse block (PCB - printed circuit board). One for brake lights and the other is for the horn. To replace relay you change the fuse block.
The brake light can be access through the trunk compartment. Take hold of the light bulb connector, turn and push in at the same time.
It is located near the top of the brake pedal.
They are AC related.