Brakes stuck on
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The way the brake lights work is the same as the S Type. There is a pressure switch positioned on the front inner right wing screwed in to a four way junction of the brake lines and has two electrical connectors and wires coming off it.. When you put your foot on the pedal it pressurizes the brake fluid in the brake pipes and this pressure switch is forced on completing a electrical circuit and the brake lights work.
If your brakes are locked and the brake lights are on that will mean you have brake fluid pressure in the brake lines that is not releasing. To release the brakes is easy. Just crack off the brake nipples on each brake caliper to release the pressure and the wheels will rotate. The brake lights will also go off.
What is causing it is a different matter. I would say that your whole braking system needs an overhaul starting with as mentioned the master cylinder. The master cylinder is where the pressure is created but normally once the pedal is released the master cylinder piston retracts and the pressure is released. It is possible that your master cylinder piston is stuck in the down position keeping pressure in the brake pipes. Depending on how old your brake fluid is but old brake fluid retains moisture and eventually it crystallizes stopping the pistons in the master cylinder and the pistons in the calipers from retracting. Brake fluid should be changed every couple of years especially on a car that sits around a lot to stop it getting too waterlogged. Water in the fluid not only affects your braking capabilities because water can be compressed more than brake fluid but the water element will also cause your caliper pistons to rust and stick in the calipers.
If your brakes are locked and the brake lights are on that will mean you have brake fluid pressure in the brake lines that is not releasing. To release the brakes is easy. Just crack off the brake nipples on each brake caliper to release the pressure and the wheels will rotate. The brake lights will also go off.
What is causing it is a different matter. I would say that your whole braking system needs an overhaul starting with as mentioned the master cylinder. The master cylinder is where the pressure is created but normally once the pedal is released the master cylinder piston retracts and the pressure is released. It is possible that your master cylinder piston is stuck in the down position keeping pressure in the brake pipes. Depending on how old your brake fluid is but old brake fluid retains moisture and eventually it crystallizes stopping the pistons in the master cylinder and the pistons in the calipers from retracting. Brake fluid should be changed every couple of years especially on a car that sits around a lot to stop it getting too waterlogged. Water in the fluid not only affects your braking capabilities because water can be compressed more than brake fluid but the water element will also cause your caliper pistons to rust and stick in the calipers.
Last edited by Cass3958; 03-03-2020 at 08:36 AM. Reason: more info
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Rakka
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08-06-2012 08:33 AM
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