Question about Volvo 780
You can have a bad dash valve, your yellow / red pull valve to set the brakes may be leaking internal. get the truck as quite as you can, build air till the gov. pops and shut off the engine. Listen at the dash for a air leak. Open the hood and look for a yellow hose, (right at the steering rod as it goes into the dash firewall, the end should be right at the fender well). feel the end of this hose for an air leak, if there is air escaping that indicates the dash valve is leaking. Next does the tractor brake lights stay on, if they do, check the switch on the brake pedal, one small air line goes to it this switch. If this switch is bad that can cause your condition. Hope this helps.
Posted on Nov 10, 2010
Brake failure warning light: If the light comes on while driving or braking, stop immediately, open the
hood and check the brake fluid level in the
- Fluid level below MIN mark: Do NOT drive. Tow car to shop for check/repair of brake system.
- Fluid level between MIN and MAX mark: proceed immediately and with caution to a Volvo dealer for an inspection of the brake system.
Posted on Nov 08, 2010
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Posted on Jan 02, 2017
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