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05-02-2010, 07:35 PM
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#1 |
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402 BIG BLOCK
Join Date: Mar 2006
Location: McClelland IA
Posts: 286
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How far is the master cylinder pushrod supposed to stick out.
How far is the master cylinder pushrod supposed to stick out.
I just bought this 72' truck a couple weeks ago. Truck has power brakes. The brake pedal is very hard all the time(vac hose was hooked up to booster before). The master cylinder looked like crap so i took it off and the rod seems to stick out very far. Currently it sticks out 1 1/4" past the mc mounting surface. Anybody know how far it is supposed to stick out?? I'm not sure if this is the reason why my brake are crappy or not. Thanks guys
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1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala Last edited by bcj67chevy; 05-02-2010 at 07:36 PM. |
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05-02-2010, 07:41 PM
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#2 |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 20,012
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Re: How far is the master cylinder pushrod supposed to stick out.
It sounds like your booster needs replacing....IE no vacuum assist. That rod sticking out should be easy to push in and out by hand.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul |
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05-02-2010, 08:08 PM
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#3 |
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402 BIG BLOCK
Join Date: Mar 2006
Location: McClelland IA
Posts: 286
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Re: How far is the master cylinder pushrod supposed to stick out.
the rod is in all the way right now. the rod comes out easy from the booster.
For where the rod is now, that would mean that the mc would be pushed in over 1 1/2" to begin with, is this right?
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1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala |
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05-02-2010, 08:13 PM
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#4 |
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Senior Member
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,236
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Re: How far is the master cylinder pushrod supposed to stick out.
nt really there is a hole int he back of the mc the rod slides down in
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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05-02-2010, 08:14 PM
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#5 |
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Senior Member
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,236
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Re: How far is the master cylinder pushrod supposed to stick out.
wooooo wooooo wooooo is the vacuumm line for the brake booster hooked tot eh vavle cover?????? if it is that not getting you the vaccum for the booster
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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05-02-2010, 08:18 PM
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#6 | |
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402 BIG BLOCK
Join Date: Mar 2006
Location: McClelland IA
Posts: 286
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Re: How far is the master cylinder pushrod supposed to stick out.
Quote:
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1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala |
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05-02-2010, 08:31 PM
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#7 | |
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402 BIG BLOCK
Join Date: Mar 2006
Location: McClelland IA
Posts: 286
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Re: How far is the master cylinder pushrod supposed to stick out.
Quote:
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1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala |
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05-04-2010, 01:40 PM
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#8 |
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Senior Member
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,236
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Re: How far is the master cylinder pushrod supposed to stick out.
okay i was wondering it looked alot it it was was just checking
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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05-04-2010, 01:47 PM
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#9 |
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I wish I was a cowboy
 
Join Date: Apr 2008
Location: Rohnert Park, CA
Posts: 409
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Re: How far is the master cylinder pushrod supposed to stick out.
If it helps, 3/4T and 1/2T brake equipment is different...including master cyl rod lengths, etc.
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-Kris Met list: Cyclone,Wilson,TranzAm,extd56,hotrodhomi,mnky30,Rokcrln,Brad,JerryJones(well, his truck anyway). |
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05-04-2010, 06:11 PM
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#10 |
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Registered User
Join Date: Jan 2006
Location: Take Off
Posts: 1,908
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Re: How far is the master cylinder pushrod supposed to stick out.
Push rod looks ok to me, just like mine. Just make sure that the hole in the master cylinder piston is the same length as your push rod so that the push rod just almost bottoms out in the hole but does NOT bottom out. Make sure booster is hooked up to full manifold vacuum like at the intake or the baseplate of the carb. May want to use a Mity Vac and make sure that the booster is not leaking. Autozone has replacements for about $100.
Last edited by mclairmo; 05-04-2010 at 06:12 PM. |
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