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1982 MC9 PARKING BRAKE Mark 10-18-10  
I have a 1982 MC9 bus. On a couple of occasions my parking brake didn't want to release. I had to push down on the brake a few times or even back then forward the bus before they'd unlock. I took this to my mechanic and he said he didn't see anything wrong with them. The brakes themselves work fine. I've had the bus for two years and this has happened on 3 different occassion.
Re: 1982 MC9 PARKING BRAKE BUBBA THE BUS TECH 10-18-10  
Proper operation of MCI and GMC motor coach Park brakes:
To release push down button, depress service brake peddle to floor and hold for 5 count (Seconds). Park brake should completly release when brake pedle is released.
If this does not work do not re-aply park brake, pump brakes until compresor cuts in and wait until compressor cuts out. Re-pply service brake for 5 count.
In emergency repeat untill it finally releases.
To repair:
There is a pressure regulator that controls the park brake application pressure and force. Check it to insure it is set and working correct. Check to be sure but I belive it should be set to 80 psi. If the pressure is correct you will need to change one or both DD3 drive axle brake pots. I recomend replacement in pairs. Most good parts guys at heavy duty parts suppliers can get these for you but I used to order from Nova Bus or MCI direct.
The shaft the rollers grip to hold the park brake applied even with no air pressure is worn with groves that will not alow the rollers to release.
Good Luck
Re: 1982 MC9 PARKING BRAKE aldo 10-18-11  
I highly recommend Jose Crespo to rebuild the actuator. I just had the actuator of my RV rebuilt and the unit works better than new. Jose was incredibly honest, helpful and knowledgeable. Before I even send the actuator to him, he gave me “FREE” troubleshooting info. Who does that nowadays?

I only had 2 options:

Option 1: Rebuild my actuator with Jose Crespo for $450.00 (free shipping) for a P/N R1PT40H actuator with 5 years warranty, and the turnaround was only 3 days.

Option 2: Purchase a new unit from GM at $1,586.94 (plus sales tax and shipping cost) with only 1 year warranty and delivery of 4-6 weeks.

If you need help contact Jose Crespo at (305) 218-8875 or via email at P30ACTUATOR@AOL.COM

God Bless!
ALDO RUIZ
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