Can you lock up your brakes? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

slamd58 · 05-30-2005, 01:15 AM

Yep that's right I locked up my brakes on my Blazer today!

I installed a new brake booster from a 1971-1972 3/4 ton and man I can not believe what a difference the new booster made. I got the booster from Napa Auto parts and it cost me $113. This has got to be the best performance boost that we can get on our Blazers for just over $100.

I just unbolted the old and bolted on the new. It sticks a little further out than the old one since it has a larger canister but that is it. I was a little concerned that because the push rod was quite a bit shorter on the new booster, but the parts store was closed so I thought what the heck. I installed it anyway and fired her up. Works like a Charm!

slamd58 · 05-30-2005, 02:00 AM

ooppss I forgot to add some things. My blazer has 35" tires with 15" x 10" rims and is lifted 4".

Huck · 05-30-2005, 08:23 AM

Your old booster was probably shot and I suspect a 1/2 ton booster would have given you the same result. Now I have to do the same thing as my brakes couldn't lock up a go cart tire!!

LUV2XCLR8 · 05-30-2005, 08:32 AM

My 1/2 ton booster is brand new and I can't do it, gonna do the 3/4 ton swap
as soon as I can get a few other things fixed on the list, it's always something.

*Medicanman71* · 05-30-2005, 09:59 AM

I had new pads.... new rear drums... and a new 1/2 ton booster replaced and i can lock them up. The prob. w/ the old one was my back breaks were so shot for so long, and locking up just about no matter what... that the pads were pushed to far out and we couldnt bleed them anymore...... anyways i have the new booster now (w/ front discs) and it can lock them up fine, if i want to....

Luv maybe its cuz i only have 31's and you have what... something a little bigger heh

aztxk5 · 05-30-2005, 11:04 AM

Yep, I did the same booster change a couple of weeks ago. It's great!
2" lift w/ 32's for now.
Al

pound41 · 05-30-2005, 04:51 PM

I have had my blazer 24yrs and It would lock up 14's with a lift when I first got with the 1/2 ton booster. But not know it has faded. Time for a new booster. I will do the 3/4ton swap but I used to lock them up just to hear them all squall

RED72blazer · 05-30-2005, 05:57 PM

just re did the entire brake system in my truck, new master, wheel cylinder's, calipers, rotors, everthing, except the booster. Just redid the booster last week. still can't lock them up. going to do the 3/4 ton booster swap next week, we shall see how it goes.

slamd58 · 05-31-2005, 12:12 AM

One other change I forgot to mention is the metal support that bolts onto the front of the booster and master cylinder no longer fits since the 3/4 ton booster is deeper. I didn't think it would hurt to leave it off. Idrove it again today and still can't belive the difference....

skid · 06-01-2005, 12:23 AM

Quote:

Originally Posted by slamd58

One other change I forgot to mention is the metal support that bolts onto the front of the booster and master cylinder no longer fits since the 3/4 ton booster is deeper. I didn't think it would hurt to leave it off. Idrove it again today and still can't belive the difference....

I made my brace fit with the 3/4 booster. The booster made one heck of a difference with my truck. I also added a C3 Corvette M/C so I can upgrade to four wheel disk brakes. I made my own plunger rod as well so I had very little pedal slop (less tha 1 " travel).

FRENCHBLUE72 · 06-05-2005, 01:50 AM

I can lock mine up just fine in the dirt but the pavement I can honestly say I have never tried to lock em up on the street..

slamd58 · 06-08-2005, 01:08 AM

Quote:

Originally Posted by FRENCHBLUE72

I can lock mine up just fine in the dirt but the pavement I can honestly say I have never tried to lock em up on the street..

My brakes were very iffy when braking... There were times when I was worried if I was actually going to get stopped in time. there were several times when I had to almost push my foot through the floor. I would say the pressure is almost 50% less now AND I was actually able to lock them up (accidently). I was going about 50 and hit the brakes hard to see how the beast would slow and my brakes locked up..... scared the crap out of me....lol

*Medicanman71* · 06-08-2005, 01:24 AM

I think my 71 blazer breaks WAY better then a 2002 Durango SXT i also drive... man that thins ABS is so fuct up is dangerous. The worst pulsing i've ever felt... either locking up, or not breaking at all..... i feel WAY better stopping the blazer!?!?!?!!

3wbdriver · 06-08-2005, 03:24 PM

Any of youse guys replacing boosters, stock or heavier, needs to check your rear wheel pistons after a week or so. I blew both my rear wheel pistons after a stock booster install a couple years ago. The additional pressure from the rebuilt booster was too much for the old wheel pistons.

71jimmy · 06-08-2005, 07:48 PM

Good advice!!!!!!

05-30-2005, 01:15 AM	#1
slamd58 <- Determination Pays Off Join Date: Dec 2004 Location: Klamath Falls, OR Posts: 77	Can you lock up your brakes? Yep that's right I locked up my brakes on my Blazer today! I installed a new brake booster from a 1971-1972 3/4 ton and man I can not believe what a difference the new booster made. I got the booster from Napa Auto parts and it cost me $113. This has got to be the best performance boost that we can get on our Blazers for just over $100. I just unbolted the old and bolted on the new. It sticks a little further out than the old one since it has a larger canister but that is it. I was a little concerned that because the push rod was quite a bit shorter on the new booster, but the parts store was closed so I thought what the heck. I installed it anyway and fired her up. Works like a Charm! __________________ 1958 Chevy Pickup 350/350, PS, PB, Tilt, A/C, 4 wheels Discs, 17" Wheels. Full Leather Interior - SOLD 1972 CST Blazer 454/400, A/C, 4" lift, 35's, Double wall top

05-30-2005, 02:00 AM	#2
slamd58 <- Determination Pays Off Join Date: Dec 2004 Location: Klamath Falls, OR Posts: 77	ooppss I forgot to add some things. My blazer has 35" tires with 15" x 10" rims and is lifted 4". __________________ 1958 Chevy Pickup 350/350, PS, PB, Tilt, A/C, 4 wheels Discs, 17" Wheels. Full Leather Interior - SOLD 1972 CST Blazer 454/400, A/C, 4" lift, 35's, Double wall top

05-30-2005, 08:32 AM	#4
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	My 1/2 ton booster is brand new and I can't do it, gonna do the 3/4 ton swap as soon as I can get a few other things fixed on the list, it's always something. __________________ 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

05-30-2005, 05:57 PM	#8
RED72blazer urban fourwheelin Join Date: Aug 2002 Location: Seattle Posts: 1,007	just re did the entire brake system in my truck, new master, wheel cylinder's, calipers, rotors, everthing, except the booster. Just redid the booster last week. still can't lock them up. going to do the 3/4 ton booster swap next week, we shall see how it goes. __________________ 1972 K5 Blazer with Cummins 4BT, NV4500 swap in the parts gathering stage.

05-31-2005, 12:12 AM	#9
slamd58 <- Determination Pays Off Join Date: Dec 2004 Location: Klamath Falls, OR Posts: 77	One other change I forgot to mention is the metal support that bolts onto the front of the booster and master cylinder no longer fits since the 3/4 ton booster is deeper. I didn't think it would hurt to leave it off. Idrove it again today and still can't belive the difference.... __________________ 1958 Chevy Pickup 350/350, PS, PB, Tilt, A/C, 4 wheels Discs, 17" Wheels. Full Leather Interior - SOLD 1972 CST Blazer 454/400, A/C, 4" lift, 35's, Double wall top

05-30-2005, 08:23 AM	#3
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,261	Your old booster was probably shot and I suspect a 1/2 ton booster would have given you the same result. Now I have to do the same thing as my brakes couldn't lock up a go cart tire!!

05-30-2005, 09:59 AM	#5
Medicanman71 Account Suspended Join Date: May 2005 Location: Where the Wild Things Are Posts: 696	I had new pads.... new rear drums... and a new 1/2 ton booster replaced and i can lock them up. The prob. w/ the old one was my back breaks were so shot for so long, and locking up just about no matter what... that the pads were pushed to far out and we couldnt bleed them anymore...... anyways i have the new booster now (w/ front discs) and it can lock them up fine, if i want to.... Luv maybe its cuz i only have 31's and you have what... something a little bigger heh

05-30-2005, 11:04 AM	#6
aztxk5 Registered User Join Date: Jan 2005 Location: Azle, Texas USA Posts: 48	Yep, I did the same booster change a couple of weeks ago. It's great! 2" lift w/ 32's for now. Al

05-30-2005, 04:51 PM	#7
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,268	I have had my blazer 24yrs and It would lock up 14's with a lift when I first got with the 1/2 ton booster. But not know it has faded. Time for a new booster. I will do the 3/4ton swap but I used to lock them up just to hear them all squall

06-05-2005, 01:50 AM	#11
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	I can lock mine up just fine in the dirt but the pavement I can honestly say I have never tried to lock em up on the street.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

06-08-2005, 01:24 AM	#13
Medicanman71 Account Suspended Join Date: May 2005 Location: Where the Wild Things Are Posts: 696	I think my 71 blazer breaks WAY better then a 2002 Durango SXT i also drive... man that thins ABS is so fuct up is dangerous. The worst pulsing i've ever felt... either locking up, or not breaking at all..... i feel WAY better stopping the blazer!?!?!?!!

06-08-2005, 03:24 PM	#14
3wbdriver Registered User Join Date: Aug 2003 Location: West Central Louisiana Posts: 82	Any of youse guys replacing boosters, stock or heavier, needs to check your rear wheel pistons after a week or so. I blew both my rear wheel pistons after a stock booster install a couple years ago. The additional pressure from the rebuilt booster was too much for the old wheel pistons. __________________ '72 Blazer, 4WD, 350/4 spd. Affectionately known as "Da Beast" '04 Silverado (new daily driver) '00 Intrepid (wife's ride) It's a BLAZER dude! No options, no emblems, no a/c, no fancy shmancy. It's a BLAZER....

06-08-2005, 07:48 PM	#15
71jimmy Registered User Join Date: Mar 2004 Location: Sacramento, CA Posts: 1,083	Good advice!!!!!! __________________ '71 Jimmy, 350, SM465, NP205, 2in Tuff Country lift, 33s on rallies, TBI, softtop and hardtop "If life was fair you'd be able to afford one of each and a garage large enough to house them all."

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