Big cam & power brakes? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jack'd up · 03-09-2004, 12:33 AM

I drove a truck that had a 305 cam in it with power brakes. The brake system looked new but didn't work well. Could this be because of the cam or is the power brake booster bad (it is the only thing not new)? The pedal goes down fine but does not come right back up and doesn't stop well. I would like some input on the problem before I buy the truck. Should this need a vac canister?

Longhorn Man · 03-09-2004, 01:03 AM

if you were having a vacume problem, then the pedal would be hard, like when the engine is off.
Sounds like you are having a booster problem to me.
By 305 cam, you don't mean a cam from a 305 small block do you?

FirstGen · 03-09-2004, 02:11 AM

305 is prolly the duration

PR454SS · 03-09-2004, 03:53 AM

Got a *305 cam in a SWB, I have got a vacuum canister on it and it works very well. I do not have any problems with it but the brake system is all new.

dion · 03-09-2004, 02:21 PM

I've got a 306 duration cam with a stock break system and haven't really had any problems. the pedal's a little hard now and then but the breaks seem to work fine.

griesel72 · 03-09-2004, 02:37 PM

Geez, i have a 292 duration cam, and i thought it idled rough, how do you guy's trucks even keep running?

03-09-2004, 12:33 AM	#1
jack'd up Registered User Join Date: May 2003 Location: DFW Posts: 127	Big cam & power brakes? I drove a truck that had a 305 cam in it with power brakes. The brake system looked new but didn't work well. Could this be because of the cam or is the power brake booster bad (it is the only thing not new)? The pedal goes down fine but does not come right back up and doesn't stop well. I would like some input on the problem before I buy the truck. Should this need a vac canister?

03-09-2004, 02:11 AM	#3
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	305 is prolly the duration __________________ 1968 C10 build in process TT LSA/6L90e/9"

03-09-2004, 03:53 AM	#4
PR454SS Registered User Join Date: Aug 2003 Location: Louisville, TN Posts: 338	Got a *305 cam in a SWB, I have got a vacuum canister on it and it works very well. I do not have any problems with it but the brake system is all new. __________________ PR Too many projects, not enough time! 72SWB 350/350TH, 3500stall,525 lift cam 3:73 posi. Sold! 69LWB Flatbed 350/Super T-10, ported/polished 481 heads, 480 lift cam. 78SWB 468/400TH, ported/polished Alum. heads, 3:42 posi, 3000 stall on 17x8 and 18x9.5's 77 Jeep CJ-5 304V8 fiberglass body on 36" Ground Hawgs

03-09-2004, 02:21 PM	#5
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	I've got a 306 duration cam with a stock break system and haven't really had any problems. the pedal's a little hard now and then but the breaks seem to work fine. __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

03-09-2004, 02:37 PM	#6
griesel72 Senior Member Join Date: Apr 2003 Location: Howard, Kansas USA Posts: 1,997	Geez, i have a 292 duration cam, and i thought it idled rough, how do you guy's trucks even keep running? __________________ 1969 K10 Custom 10 1997 Z71 2006 Volkswagen Jetta TDI 2006 King Ranch 1980 Wife

03-09-2004, 01:03 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	if you were having a vacume problem, then the pedal would be hard, like when the engine is off. Sounds like you are having a booster problem to me. By 305 cam, you don't mean a cam from a 305 small block do you?

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