Hard Brake Pedal - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

HardrockSS · 10-23-2017, 07:43 PM

I’m having a issue when braking hard after heavy acceleration. My pedal feels very hard and really have to push hard to stop. Just installed 6 piston Stoptech upfront, stock rears. Fresh fluid. Possibly loosing vacuum?

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KillboyPowerhead · 10-23-2017, 08:31 PM

Do you get a hard pedal only after hard acceleration? With heavy acceleration/going WOT there is less vacuum in the manifold so I guess that would create a weaker vacuum for the brake booster. Do you still have the original master cylinder or did you upgrade it to a bigger one (such as a ZL1 one)? If you get a hard pedal all of the time, then assuming everything was installed properly there could be an issue with the brake booster (hose from intake manifold leaking; booster leaking; etc.).

HardrockSS · 10-24-2017, 06:44 PM

Quote:

Originally Posted by KillboyPowerhead

Do you get a hard pedal only after hard acceleration? With heavy acceleration/going WOT there is less vacuum in the manifold so I guess that would create a weaker vacuum for the brake booster. Do you still have the original master cylinder or did you upgrade it to a bigger one (such as a ZL1 one)? If you get a hard pedal all of the time, then assuming everything was installed properly there could be an issue with the brake booster (hose from intake manifold leaking; booster leaking; etc.).

I still have the stock one

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KillboyPowerhead · 10-25-2017, 05:38 AM

Just a guess, but maybe with less vacuum in the manifold (weaker brake booster) and a possibly undersized master cylinder you'll get inadequate braking until the engine RPM's drop. Maybe someone with the same setup as you will chime in.

JusticePete · 10-25-2017, 08:11 PM

There is a good possibility you are in ICE Mode. What oads are you using the the six pot stoptechs?

HardrockSS · 10-26-2017, 08:03 AM

I'm using the Gs-1 for the street, but this was happening with the stock brakes too.

HardrockSS · 10-26-2017, 05:57 PM

I did find a tear in the vacuum hose ,hopefully this fixes it.

Spurshot · 10-26-2017, 11:15 PM

Quote:

Originally Posted by HardrockSS

I did find a tear in the vacuum hose ,hopefully this fixes it.

Bingo!

Ttwerie · 07-10-2020, 10:10 AM

Help
Hard break pedal and brakes not responsive usually on a cold start. Just had tires rotated and problem occurred after. It seems only upon initial start. Once overcome brakes work fine!! Any ideas would be greatly appreciated. Vacuum??

Level300 · 07-10-2020, 10:39 AM

Quote:

Originally Posted by Ttwerie

Help
Hard break pedal and brakes not responsive usually on a cold start. Just had tires rotated and problem occurred after. It seems only upon initial start. Once overcome brakes work fine!! Any ideas would be greatly appreciated. Vacuum??

Mine does this too but only after the car sits for 3+ days. I only discovered this when I started working from home. Starting every day or every 2 days, it’s fine. I had no work done to my car. Other than that, once the car turns over, the pedal releases and works normally.

olblue75 · 07-10-2020, 10:19 PM

Is the ZL1 master cylinder different than any other V8 car???

10-23-2017, 07:43 PM	#1
HardrockSS Drive Fast Take Chances Drives: 2012 45th anniversary SS Join Date: Apr 2012 Location: cape cod Posts: 560 View My Garage	Hard Brake Pedal I’m having a issue when braking hard after heavy acceleration. My pedal feels very hard and really have to push hard to stop. Just installed 6 piston Stoptech upfront, stock rears. Fresh fluid. Possibly loosing vacuum? Sent from my iPad using Tapatalk __________________ 2012 45th Ls3 M6:ECS 1500, Custom Cam ,Alky Meth kit, Mcleod Rxt, MGW shifter,Pfadt Tri-y headers Solo Mach X, 20%tint,3.91 gears ,Suspension upgrades, G-force axles.700 RWHP http://www.slowhawkperformance.com/

10-23-2017, 08:31 PM	#2
KillboyPowerhead Drives: 2015 Z/22 Join Date: Aug 2015 Location: Ontario, Canada Posts: 931	Do you get a hard pedal only after hard acceleration? With heavy acceleration/going WOT there is less vacuum in the manifold so I guess that would create a weaker vacuum for the brake booster. Do you still have the original master cylinder or did you upgrade it to a bigger one (such as a ZL1 one)? If you get a hard pedal all of the time, then assuming everything was installed properly there could be an issue with the brake booster (hose from intake manifold leaking; booster leaking; etc.). __________________ Overkill/Self Tuned; Mace Camshafts; K&N Typhoon Cold Air Intake; Ported 80mm Throttle Body/Intake Manifolds/Manifold Spacer; Solo Performance High-Flow Cats, Cat-back Exhaust; Vitesse Motorsports Throttle Controller; Elite Engineering E2 Catch Can; BC Racing BR Coilovers; JPSS Delrin Radius Rod Bushing Inserts, Sway Bars; Pegasus Aluminum Rear Cradle Bushings, Camber/Caster Plates; Z/28 Toe Links, Trailing Arms, Upper Control Arm Bushings, Rear Shock Mounts

10-25-2017, 05:38 AM	#4
KillboyPowerhead Drives: 2015 Z/22 Join Date: Aug 2015 Location: Ontario, Canada Posts: 931	Just a guess, but maybe with less vacuum in the manifold (weaker brake booster) and a possibly undersized master cylinder you'll get inadequate braking until the engine RPM's drop. Maybe someone with the same setup as you will chime in. __________________ Overkill/Self Tuned; Mace Camshafts; K&N Typhoon Cold Air Intake; Ported 80mm Throttle Body/Intake Manifolds/Manifold Spacer; Solo Performance High-Flow Cats, Cat-back Exhaust; Vitesse Motorsports Throttle Controller; Elite Engineering E2 Catch Can; BC Racing BR Coilovers; JPSS Delrin Radius Rod Bushing Inserts, Sway Bars; Pegasus Aluminum Rear Cradle Bushings, Camber/Caster Plates; Z/28 Toe Links, Trailing Arms, Upper Control Arm Bushings, Rear Shock Mounts

10-26-2017, 08:03 AM	#6
HardrockSS Drive Fast Take Chances Drives: 2012 45th anniversary SS Join Date: Apr 2012 Location: cape cod Posts: 560 View My Garage	I'm using the Gs-1 for the street, but this was happening with the stock brakes too. __________________ 2012 45th Ls3 M6:ECS 1500, Custom Cam ,Alky Meth kit, Mcleod Rxt, MGW shifter,Pfadt Tri-y headers Solo Mach X, 20%tint,3.91 gears ,Suspension upgrades, G-force axles.700 RWHP http://www.slowhawkperformance.com/

10-26-2017, 05:57 PM	#7
HardrockSS Drive Fast Take Chances Drives: 2012 45th anniversary SS Join Date: Apr 2012 Location: cape cod Posts: 560 View My Garage	I did find a tear in the vacuum hose ,hopefully this fixes it. __________________ 2012 45th Ls3 M6:ECS 1500, Custom Cam ,Alky Meth kit, Mcleod Rxt, MGW shifter,Pfadt Tri-y headers Solo Mach X, 20%tint,3.91 gears ,Suspension upgrades, G-force axles.700 RWHP http://www.slowhawkperformance.com/

10-25-2017, 08:11 PM	#5
JusticePete Drives: Camaro Justice Join Date: Jun 2007 Location: Virginia Posts: 20,174	There is a good possibility you are in ICE Mode. What oads are you using the the six pot stoptechs?

07-10-2020, 10:10 AM	#9
Ttwerie Drives: 2013 Camaro Convertible LT1 Join Date: Mar 2015 Location: Bellmore NY Posts: 2	Hard brake pedal Help Hard break pedal and brakes not responsive usually on a cold start. Just had tires rotated and problem occurred after. It seems only upon initial start. Once overcome brakes work fine!! Any ideas would be greatly appreciated. Vacuum??

07-10-2020, 10:19 PM	#11
olblue75 Drives: 2010 2SS/RS Join Date: Dec 2009 Location: Clarksville Tennesse. Posts: 6,064	Is the ZL1 master cylinder different than any other V8 car??? __________________ Orange Krush II 1LE Front sway bar, Splitter, shocks and struts, Z28 dual mode mufflers, Intake, UCA Bushings, and Toresen 3.91 Diff. 1 piece DSS Drive Shaft, ZL1/C7 Calipers, and 32mm JPSS Rear Bar. ASC race spec splitter and wicker. 6th Gen M017 Wheels. Stainless Works 1 7/8 LTs. DSE and PAFDT Suspension components.