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06-10-2024, 01:44 PM
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#1 |
 
Drives: 2020 ZL1 A10; Shadow Gray Metallic Join Date: Sep 2020
Location: Chicago
Posts: 254
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Hiss when Applying Brakes
Was pulling into my garage last night when I could hear a hiss coming from the engine bay. Parked it and I would get a hiss upon brake application, then it would stop hissing. Releasing brake pedal I would get another hiss, then it would stop hissing. I don't recall hearing this before, but most of my brake applications I never can hear anything from the engine bay.
Wondering if anyone else has noticed this before I start diagnosing my brake booster and vacuum line.
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06-10-2024, 01:51 PM
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#2 |
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Super Stock
Drives: Chevrolet Camaro ZL1 Join Date: May 2022
Location: Concordia
Posts: 965
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It has happened on a few of the Gen V application GM's. Based on what you are talking about it wouldn't surprise me if the booster is bad, and based on the symptoms it does indeed sound like a bad booster. I would put a vacuum tester to the booster and make sure it holds pressure (or not) before fully condemning it though.
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2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi
758 HP/ 804 TQ  |
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06-10-2024, 02:04 PM
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#3 | |
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Drives: 2020 ZL1 A10; Shadow Gray Metallic Join Date: Sep 2020
Location: Chicago
Posts: 254
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Quote:
I also believe I am running lean. My exhaust tips are basically white. But no CEL or rough idle.
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