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73-87 Chevy _ GMC Trucks => Brakes, Frame, Steering & Suspension => Brakes and Braking Systems => Topic started by: knockretard on May 28, 2009, 04:59:29 pm

Title: 83 c-10, brakes spongy
Post by: knockretard on May 28, 2009, 04:59:29 pm

Hey everyone, I have a problem. First let me give you the details. It's a 83 c-10, long-bed. It has a 305 and 700r4. I purchased the truck with a spongy brake pedal. I have since replaced both front calipers and brake pads. I can't find any leaks with the system. I bleed the heck out of the thing and it fill get firm for maybe 3 pumps and thing "leak down". Also the truck has front disc brakes, but no power brakes.

Maybe someone jas had this problem before?? Any suggestions would be great.Thanks in advance.

Title: Re: 83 c-10, brakes spongy
Post by: ccz145a on May 28, 2009, 05:59:56 pm

Check the rear cylinders for leakage then check the master then the flex hoses front and rear.

Title: Re: 83 c-10, brakes spongy
Post by: VileZambonie on May 28, 2009, 06:40:23 pm

Also check the adjustment of the rear brakes. If it's creeping down which is what you are describing over spongy I would replace the master cylinder. While you're at it a power brake conversion would be a good idea.

Title: Re: 83 c-10, brakes spongy
Post by: FathomX on July 23, 2009, 02:01:14 pm

Would also suggest a vacuum test..

Title: Re: 83 c-10, brakes spongy
Post by: Irish_Alley on July 25, 2009, 12:20:28 am

i would say brake lines when they go bad they will swell up under pressure and cause spongy breaks