Search RV-Coach Online
|email Mark reply to message post new message search forums|
ATTENTION: DO NOT POST ADS IN FORUMS!|
All Postings that advertise items for sale will be deleted from the Discussion Forum. You may post sale items for free in the Classifieds section. Sign up now.
|All Messages in Thread||Author||Date|
|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.
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.
|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