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#1 |
Got Blazer?
Join Date: Oct 2004
Location: Newcastle, California
Posts: 76
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Somebody stop me!
Hey guys,
It's been a while since I've been on. My 71 4wd isn't stopping very well. I had to make an emergency stop the other day and I realized I couldn't even lock em up. Might I have a bad booster? Any ideas? Thanks in advance, Drew |
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#2 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Somebody stop me!
How must pressure do you have to apply in a normal stop?
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#3 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Somebody stop me!
How much fade on the pedal?Right away,only when hit hard,after pressure applied for awhile?
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#4 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: Somebody stop me!
One very common upgrade is to swap to 3/4 ton master/booster.
What size tires are you running? |
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#5 |
Registered User
Join Date: Jan 2006
Location: sidney , illinois
Posts: 312
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Re: Somebody stop me!
the best way to check a booster : with your truck off , apply pressure to the brake pedal , start the motor , if the pedal moves down , the booster is good.
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hey.....smell my finger 64 nova wagon , 63 nova convertible |
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#6 |
Registered User
Join Date: Jan 2005
Location: Colorado Springs
Posts: 693
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Re: Somebody stop me!
71-72 1/2 ton trucks and K5's brakes suck in my opinion. My GMC is the same way in panic situations, and for towing they are very underpowered and fade out easy. I have replaced everything in my braking system and have achieved nothing as far as better performing brakes. I will be getting a ¾ ton power brake booster for both my K1500 and my Blazer that is the way to go. If you noticed that GM addressed the problem with the 73 ½ ton’s and K5’s they went to a larger dual diaphragm power brake booster and wider brake shoes in the rear otherwise they are basically the same braking system but stop much better. The 67-70 ½ ton trucks used drum front brakes and the power brake booster was adequate for a 4 drum braking system but in 71 they changed to disc brakes and still used the old power brake booster and that is why they suck. When I drive my Dad’s 70 K20 I just about put myself through the windshield the first time I tap on the brakes, and that is what makes me realize how bad mine really are.
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1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder |
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#7 | |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: Somebody stop me!
Quote:
Scares me just reading it ![]()
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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#8 |
Account Suspended
Join Date: May 2005
Location: Where the Wild Things Are
Posts: 696
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Re: Somebody stop me!
Luvy u havent mobbed yours around enuff to have any "emergency stop" situations, huh?
![]() or have you just gone out and gotten on the brakes as hard as possible to find out how yours stops? |
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#9 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: Somebody stop me!
Mine is 100% new parts, pads, rotors, drums, shoes, lines, m/c,
booster, ppv, fluid, everything and it doesn't stop very well ![]()
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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#10 | |
Where's my beer?
Join Date: Aug 2002
Location: I live in the state of denial....
Posts: 5,621
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Re: Somebody stop me!
Quote:
Meybe yours only need a good bleeding?
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Paul How do you make the invisible, visible?.........You take it away. |
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#11 | |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: Somebody stop me!
Quote:
Oooooops, I forgot, we gravity bled it, power bled it, bench bled the mc, and I still got squishy brakes, I think my 4wd needs the 3/4 ton upgrade
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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#12 |
Got Blazer?
Join Date: Oct 2004
Location: Newcastle, California
Posts: 76
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Re: Somebody stop me!
I'm running 33's on a 4" lift. During normal driving situations it seems to be adequate. The pedal seems a little stiff. I've bled a couple of times thinking "this time I'll get it". So I don't think that's the problem. I just want to make sure that, before I upgrade, there isn't anything else I could do.
And speaking of upgrade; has anyone done a rear disc conversion kit with e-brake that they'd be willing to recommend? Thanks for the input. Drew |
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#13 |
Registered User
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 215
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Re: Somebody stop me!
mines exactly the same, i got new everything also. looking into doing a 3/4ton system now its scary driving on the freeway when everyone stop's and your left hoping your truck stops..
-Cameron
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1972 Dark blue, Cst, Highlander |
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#14 | |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: Somebody stop me!
Quote:
![]() High Angle sells a drive shaft e-brake set up. http://highangledriveline.com/ ![]() Last edited by vtblazer; 02-24-2006 at 07:40 AM. |
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#15 |
Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,269
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Re: Somebody stop me!
Similar crappy braking with my blazer. Just swapped to a 3/4 ton booster--same problem. The only thing I haven't replaced is the calipers which will be next. Given that 70-80% of the braking comes from the front and I can lock up the right rear, I'm hoping this is the problem. What a PITA though!!
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#16 |
Registered User
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 215
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Re: Somebody stop me!
im gonna try steel braided lines and a correct brake job, somthing tells me the PO just slapped pads on a glazed over rotor.
-Cameron
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1972 Dark blue, Cst, Highlander |
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#17 | |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: Somebody stop me!
Quote:
![]() ![]() Now that you mention it, my one ton has those as well. |
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#18 |
Registered User
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 215
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Re: Somebody stop me!
yea i figured it would be a good mod regardless if i stayed with 1/2 ton brakes or went to a 3/4 ton setup. never know, they just might fix the problem.
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1972 Dark blue, Cst, Highlander |
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#19 | |
Active Member
Join Date: May 2005
Location: Hawaii
Posts: 153
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Re: Somebody stop me!
Quote:
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#20 |
Registered User
Join Date: Apr 2005
Location: bernardston ma
Posts: 33
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Re: Somebody stop me!
ya must be nice. im not messing around. im getting the hydrobust setup from a 73 style one ton. that will solve my breaking problems. my dads 83 one ton stops better than most new trucks.
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70 blazer/pickup 104" wheelbace |
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#21 |
FNG to resto/mod world!
Join Date: Nov 2005
Location: Spokane, Wa
Posts: 196
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Re: Somebody stop me!
Just curious.......does the 3/4 ton setup just bolt on to the Blazer? Sounds like a no brainer if it does.
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71 GMC Jimmy - under construction 75 GMC K25 Sierra Grande - under deconstruction 92 Chevy K2500 ECSB - sold 04 Nissan Titan ECSB Off Road - sold & missed 13 Ford F-150 Ecoboost (work truck) - sold 16 Ford F-150 Ecoboost (work truck) ![]() |
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