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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 87-c10 on November 27, 2014, 07:33:04 pm

Title: 87 c10 rear end drops when accelerating from a stop
Post by: 87-c10 on November 27, 2014, 07:33:04 pm

hello all!
my name is 87-c10 8) and this is my first post to any forum on the interweb!
so it started last week, i came to a stop and when i went to accelerate again the truck kind of did a squat and it took much more gas to get it going (manual 3spd)
it feels exactly like the parking brake is still engaged, but its not. any thoughts?
thanx for reading!

Title: Re: 87 c10 rear end drops when accelerating from a stop
Post by: rich weyand on November 27, 2014, 09:48:31 pm

How do you know it's not?  The pedal can come up and the brake still be engaged due to a stuck cable.

Title: Re: 87 c10 rear end drops when accelerating from a stop
Post by: 87-c10 on November 28, 2014, 08:09:22 pm

well, when you put it that way rich.. i guess i dont know for sure. does anybody know how i can check to see if the parking brake is fully disengaged?

Title: Re: 87 c10 rear end drops when accelerating from a stop
Post by: frotosride on November 28, 2014, 08:55:49 pm

Jack up the rear and put jack stands under each side of the axle. Try spinning the tires. You will easily notice binding. If this is the case check the condition of your ebrake cables if they look as old the the try k.. Give them a kick and they often will release. I did this for at least a month until I got the time to put my new cables on.

Title: Re: 87 c10 rear end drops when accelerating from a stop
Post by: Dr_Snooz on November 28, 2014, 10:33:35 pm

The plastic coating on my parking brake cable started coming off. This caused it to bind in the cable housing and not release. When I cut the coating off, it worked again. Very cheap fix.

Title: Re: 87 c10 rear end drops when accelerating from a stop
Post by: Irish_Alley on November 28, 2014, 10:34:14 pm

also sometimes going backward will release the ebrake.

Title: Re: 87 c10 rear end drops when accelerating from a stop
Post by: 87-c10 on November 29, 2014, 11:13:50 pm

my truck has been out of commission for about a week due to a fuel pump. today when i was trying to roll it onto the driveway to drop the tank it wouldn't budge. however pushing it backwards was a walk in the park. it was incredibly easy to roll backwards, but if you try to push it forward, it barely creeps and it feels like the brakes are being held. 4x4 is in N and so is the clutch. any ideas gentlemen? 

Title: Re: 87 c10 rear end drops when accelerating from a stop
Post by: Irish_Alley on November 29, 2014, 11:37:21 pm

ebrake dragging? wiggle the cable

Title: Re: 87 c10 rear end drops when accelerating from a stop
Post by: rich weyand on November 30, 2014, 03:29:49 am

Yeah, your brake cable froze/rusted in place.  It is much easier to go backward than forward on the emergency brake.

You need to see where it is freezing up.  With the vehicle in gear and the transfer case in gear, and the wheels chocked, on level ground, have someone set and release the emergency repeatedly while you watch what is going on.  Note what moves and what does not.  Silikroil or PBBlaster or WD-40 (in decreasing order of preference) should be applied to the sticking bits, and see if you can get them to free up.

Title: Re: 87 c10 rear end drops when accelerating from a stop
Post by: 87-c10 on November 30, 2014, 10:20:44 am

thnx for the replies fellas, ill look around the cables and report back my findings