Brake Whooshing Noise After V6 to V8 Conversion - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

hush18 · 04-29-2018, 11:42 AM

I did the v6 to v8 brake conversion yesterday. A friend and I replaced the lines with stainless steel, put on the new rotors, pads, and calipers, then we swapped the master cylinder for the v8 master cylinder after bench bleeding it. We then did a pump method brake bleed.

A strange issue that I’m running into now is that when the car is on and in park, the pedal feels spongy and when the pedal travels about halfway down, there’s a whooshing noise coming from the firewall near the pedal. What could this sound be? Is it an indication that something needs to be fixed or is this now going to be the new normal? I would expect the pedal to be a lot harder than it is with the new brake setup. When the car is off and the pedal is pumped, it does get very hard.

Thoughts?

43Camaro · 04-29-2018, 11:00 PM

Get a power bleeder and bleed the brakes again just to eliminate possibility of air in the system.

Pro-tuned · 04-30-2018, 10:31 PM

Check vacume booster

600hp-lpe · 11-02-2018, 08:48 AM

spongy pedal - bleed the brakes again. you may need to get the ABS to cycle as well.

04-29-2018, 11:42 AM	#1
hush18 Drives: 2012 2LT RS Join Date: Feb 2013 Location: Baltimore Posts: 227	Brake Whooshing Noise After V6 to V8 Conversion I did the v6 to v8 brake conversion yesterday. A friend and I replaced the lines with stainless steel, put on the new rotors, pads, and calipers, then we swapped the master cylinder for the v8 master cylinder after bench bleeding it. We then did a pump method brake bleed. A strange issue that I’m running into now is that when the car is on and in park, the pedal feels spongy and when the pedal travels about halfway down, there’s a whooshing noise coming from the firewall near the pedal. What could this sound be? Is it an indication that something needs to be fixed or is this now going to be the new normal? I would expect the pedal to be a lot harder than it is with the new brake setup. When the car is off and the pedal is pumped, it does get very hard. Thoughts?

04-29-2018, 11:00 PM	#2
43Camaro Drives: [COTW 8/3/15] 2010 Camaro SS L99 Join Date: Mar 2015 Location: Mooresville NC Posts: 434 View My Garage	Get a power bleeder and bleed the brakes again just to eliminate possibility of air in the system. __________________ A Little bit of power. ALL WORK DONE BY ME! Just added 2021 ZL1 1LE to the Stable! https://www.camaro5.com/forums/showthread.php?t=418273

04-30-2018, 10:31 PM	#3
Pro-tuned Angewendet Ingenieur Drives: 14 Camaro ZL1 Join Date: Apr 2015 Location: USA Posts: 401	Check vacume booster __________________ ———— LQ9, Iron Block, Forged internals, 408CI, Jannetty custom cam, TS short block, Whipple, Hardened Jackshaft, PRC 260, 2X3 Dynatech Full Competition, HF Cats, CAI, NW 103, Chee, ID 1300, COPO Breather, MSD, Fore Dual Pump, ultratorque, E85, dual Meth, True Trac, 3:45, 1500hp axle-shafts, DSS CF, BMR, custom Pearl/Candy paint by Jaidah.

11-02-2018, 08:48 AM	#4
600hp-lpe Drives: 2010 Join Date: Jul 2009 Location: NH Posts: 4,788	spongy pedal - bleed the brakes again. you may need to get the ABS to cycle as well.