1976 C60 Hyd Brakes

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1976 C60 Hyd Brakes

Home > Discussion Forum > Bus Conversions - School

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All Messages in Thread	Author	Date
1976 C60 Hyd Brakes	Scoutmaster	9-24-00
We just got this bus given to us. When you press the brake pedal, the 'brake' and the elec/hyd brake' red lights come on and the pedal goes down slowly. New p/s pump & hoses didn't fix it. Help?
Re: 1976 C60 Hyd Brakes	Busman	9-25-00
Does your bus have hydraboosters on it? If so,seal might be leaking down.
Re: 1976 C60 Hyd Brakes	Mark O.	9-30-00
When a brake pedal won't stay up where it is supposed to, obviously there is a leak in the system somwhere. The trick is figuring out where the leak is. First off, are you losing brake fluid? If the bus has been sitting any amount of time in a location with lots of humidity moisture will have gotten into the system. Moisture causes rust which will ruin the seals in the wheel cylinders and master cylinder. When you push on the pedal, instead of moving the cylinder the fluid passes by the seal and leaks out. If you are not leaking fluid and the pedal goes down, the leak is most likely in the master cylinder itself. I am not real sure why you replaced the P/S pump and hoses since they only help with the boost assist. The lights will come on any time the pedal goes down too far regardless of why the pedal goes down too far. If you are having boost problems you won't notice it until you try to move the bus. If the boost isn't working properly the pedal will require a lot of pressure to slow the bus. If you have an electric over vacuum over hydralic boost, when you turn on the key you should hear the electric assist come on. If it doesn't come on, you know your where part of your boost problem is. If the electric assist comes on and the pedal still goes down, the problem will most likely be in the master cylinder. After starting the engine when you apply the brakes, if you hear the sound of air escaping as you apply the pedal, most likely the vacuum/hydralic assist is working. If the pedal still goes down, the problem most likely is in the master cylinder. Brake fluid attracts moisture unless the fluid is the silicone type. The reason why manufacturers like Mercedes requires annual brake fluid replacement is when moisture is added to brake fluid the boiling point is dramatically reduced. On a long down grade the heat of braking will be transferred to the fluid as well. If the temp rises high enough it can literally boil the fluid away and then you won't have any brakes. If you find the problem is in the master cylinder, after you R&R the master cylinder, flush all of the old brake fluid out and put new fluid in. Good luck and let us know how you solved your problem. Mark O.
Re: 1976 C60 Hyd Brakes	Scoutmaster	9-26-00
It does have a hydrobooster in front of the master cylinder.(hydro only, no vacuum boost) What seal and can I get to it to fix it?