My son contaminated his brake system with the wrong fluid. We have replaced the necessary parts. We are bleeding the brakes presently and having a problem getting the fluid to the rear drivers wheel. All three other wheels bleed fine. What should we do next?
What do you mean by "necessary parts"? The only proper repair, if it was a petroleum product, is to replace everything that has rubber that contacts the fluid. If any part is not replaced the contamination will leach out and recontaminate the new parts. You must replace the master cylinder AND both reservoir cap bladder seals, front calipers, rear wheel cylinders, combination valve below the master cylinder, and all four rubber flex hoses. If the car has anti-lock brakes the accumulator and hydraulic controller must be replaced since there are rubber o-rings in it and you will never bleed all the contamination out. Some will stay in the valves while the new fluid bleeds right past it. If that is the Bendix-10 system or a similar version, the rubber hoses from the pump must also be replaced. All of the steel lines must be flushed with brake parts cleaner, then dried thoroughly. Do not install any new parts until all the lines are flushed and all the parts with rubber seals and o-rings are removed.