front disk swap uncertainty - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68lngbed350 · 08-26-2010, 02:19 AM

I upgraded my front brakes to disk on my 68 3/4 ton recently. I got the whole kit from a truck at my local junkyard including the used booster and used master(from that same truck). I bled everything and I took it for a test drive. The brake pedal has a very spongy feel, comes back up slowly when released. With alot of brake pedal effort the truck barely rolls to a stop. When I pop the hood with the engine running I can hear a hissing sound from the booster area. I confirmed the vacuum hose is not leaking. At this point all I can think of is a bad booster and/or master. I bled the brakes numerous times and checked for leaks throughout the whole system.

Suggestions? Tips? Any feedback appreciated

SCOTI · 08-26-2010, 10:23 AM

I would purchase a new master & booster. I just don't like using 'used' parts of unknown service w/brakes.

68lngbed350 · 08-27-2010, 01:56 PM

thats what i was afraid of. The last thing I wanted to do was spend more money but I think thats what I am going to have to do. Any suggestions on where to get the booster and master for a decent price online?

oldblue1968chevy · 08-27-2010, 02:35 PM

my Mc hissed because bad booster, hole in lower part of MC

bought new booster and it was fixed.. if that dont make sense i explain more im at school

08-26-2010, 02:19 AM	#1
68lngbed350 Registered User Join Date: Jun 2008 Location: Richmond,CA Posts: 26	front disk swap uncertainty I upgraded my front brakes to disk on my 68 3/4 ton recently. I got the whole kit from a truck at my local junkyard including the used booster and used master(from that same truck). I bled everything and I took it for a test drive. The brake pedal has a very spongy feel, comes back up slowly when released. With alot of brake pedal effort the truck barely rolls to a stop. When I pop the hood with the engine running I can hear a hissing sound from the booster area. I confirmed the vacuum hose is not leaking. At this point all I can think of is a bad booster and/or master. I bled the brakes numerous times and checked for leaks throughout the whole system. Suggestions? Tips? Any feedback appreciated __________________ 1968 C20 Stepside 350 sm465 4.57 - Summer Cruiser/Hauler 1980 El Camino- lil brothers dd. lt1 3.90 1970 Camaro-468 bbc t56 4.11 MONSTER! younger brothers project

08-26-2010, 10:23 AM	#2
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,919	Re: front disk swap uncertainty I would purchase a new master & booster. I just don't like using 'used' parts of unknown service w/brakes. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

08-27-2010, 01:56 PM	#3
68lngbed350 Registered User Join Date: Jun 2008 Location: Richmond,CA Posts: 26	Re: front disk swap uncertainty thats what i was afraid of. The last thing I wanted to do was spend more money but I think thats what I am going to have to do. Any suggestions on where to get the booster and master for a decent price online? __________________ 1968 C20 Stepside 350 sm465 4.57 - Summer Cruiser/Hauler 1980 El Camino- lil brothers dd. lt1 3.90 1970 Camaro-468 bbc t56 4.11 MONSTER! younger brothers project

08-27-2010, 02:35 PM	#4
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: front disk swap uncertainty my Mc hissed because bad booster, hole in lower part of MC bought new booster and it was fixed.. if that dont make sense i explain more im at school __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4



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