Gmc 2000 w3500 brake fluid resovoir location - GMC Cars & Trucks

Yes, this is okay. Keep the cap on while actuating the MC.

I am not familiar with the GMC but if all the things mentioned check out, check the timing.

How is fuel pressure? He must try to start with ether, If you turn crank by hand forward and backward you feel how much play in timing chain?

if your not loseing fluid,i sugest you check your master cylinder piston, it seems that fluid is geting past them

With the engine off pump the brakes hard and fast then holdit pressing fermly on the brake, have someone break loose a bleeder on the first one. the peddle will sink to the floor. hold it there untill the other pearson has tightend the bleeder back. repet for all the others and make sure you have plenty of brake fluid in the resovoir.

i had the same problem with my 2002 w3500 and what it ended up being was the butterfly valve for the exhaust brake which is located in the intake just as you take off the turbo line, disconnect the vacuum line on the actuator that goes to that valve and that should tell you if thats your problem

fuel line pick-up broken in the fuel tank

the clutch fluid resovoir is the same as the brake fluid resovoir

check brake fluid level, brakes, if these are okay you may have a problem with the module.
this light can be caused by low levels in the brake resovoir fluid level and/or brake pads are thin.

get a other name IFIXALL