disc brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*MJF* · 10-06-2003, 09:56 PM

When changing to discs up front, is it necessary to cahnge the prop valve to a disc/drum one?

Bryan H · 10-06-2003, 10:14 PM

Yes because it takes more pressure to work the disc brakes on the front than the drums on the back.So you need to change it. The one on the drum brakes is just actually a distribution block because on a 4 wheel drum system it takes equal amount of pressure to work all 4 wheels. Make sense?

Bryan

*MJF* · 10-07-2003, 11:23 AM

Ok so I need a new prop valve, which brings up more questions.

On the new disc/drum prop valve, will I need to rerun all the brake hard lines? i.e. is the prop valve the same as the later model trucks where each caliper gets it's own line from the prop valve?

The current set up only has one line running to the front brakes that T's at the drivers side brake hose.

Thanks
Mike

pierce · 10-07-2003, 04:27 PM

No they T, 1 line for the front discs and 1 for the drums.

Injected68LS1 · 10-07-2003, 11:31 PM

You should give Early Classic Ent. a call. They have the correct prop. valve to use for your setup. They also have a valve bracket and brake line adapters so you can use the original lines.

10-06-2003, 09:56 PM	#1
MJF No longer truckless Join Date: Mar 2002 Location: Campbell, CA Posts: 299	disc brakes When changing to discs up front, is it necessary to cahnge the prop valve to a disc/drum one?

10-06-2003, 10:14 PM	#2
Bryan H Registered User Join Date: Jul 2002 Location: Chesnee SC Posts: 254	Yes because it takes more pressure to work the disc brakes on the front than the drums on the back.So you need to change it. The one on the drum brakes is just actually a distribution block because on a 4 wheel drum system it takes equal amount of pressure to work all 4 wheels. Make sense? Bryan __________________ 1980 Malibu Classic 2 dr coupe 1964 Impala SS 4 speed 1968 GMC (major project) grandpa bought new 1969 Chevrolet C-10 Shortbed Fleetside 2008 GMC Canyon (daily driver)

10-07-2003, 04:27 PM	#4
pierce Registered User Join Date: Sep 2000 Location: Cincinnati,OH,USA Posts: 464	No they T, 1 line for the front discs and 1 for the drums. __________________ 69 GMC 1 Ton Longhorn 37 Chevy Coupe

10-07-2003, 11:31 PM	#5
Injected68LS1 Registered User Join Date: Jul 2003 Location: So. Cal. Posts: 389	You should give Early Classic Ent. a call. They have the correct prop. valve to use for your setup. They also have a valve bracket and brake line adapters so you can use the original lines. __________________ 1968 Chev SWB with 1998 Corvette LS1 305hp and 320 ftlb to the wheels (stock engine!) AEM EMS and wideband O2 sensors Bowtie Overdrive's 700R4, stage 3 Baer 4 wheel discs and 20s http://iciclelanding.com/aperture?album=2049&view=album

10-07-2003, 11:23 AM	#3
MJF No longer truckless Join Date: Mar 2002 Location: Campbell, CA Posts: 299	Ok so I need a new prop valve, which brings up more questions. On the new disc/drum prop valve, will I need to rerun all the brake hard lines? i.e. is the prop valve the same as the later model trucks where each caliper gets it's own line from the prop valve? The current set up only has one line running to the front brakes that T's at the drivers side brake hose. Thanks Mike



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