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#1
03-29-2013, 09:29 AM
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Under dash hissing noise
2008 HHR, Had heard hissing noise like a vacuum leak while releasing brake pedal, now there's a constant hissing noise coming from under the dash above the brake pedal. No changes noticed in performance. Having trouble pinning this down- can anyone help?
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#2
03-29-2013, 10:57 AM
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Re: Under dash hissing noise
Quote:
Erica Chevrolet Customer Service
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#3
03-29-2013, 11:11 AM
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Re: Under dash hissing noise
Classic vacuum brake booster leak at seal- needs replaced- engine is sucking in extra air- not good for gas mileage either.
__________________
Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles-
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#4
03-29-2013, 11:48 AM
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Re: Under dash hissing noise
Thanks for the quick replies. @ brcidd- Is there any way to verify it's gone? Do the master cylinder lines have to be broken? @ Erica- Appreciated, but no thanks, dealerships never come cheap.
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#5
03-29-2013, 12:17 PM
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Re: Under dash hissing noise
If there is plenty of room- it is a cake walk....master cylinder just unbolts from front- no need to unhook brake lines- and there are four bolts under dash and of course, brake pedal linkage- I've done 5 or 6 but never on an HHR- can be a pricey part- $120 or so- and they want a core...all depends on how much room there is to work it out.....
__________________
Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles-
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#6
03-29-2013, 01:38 PM
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Re: Under dash hissing noise
Just took a look under the hood, of course there's no room, it's tucked under the firewall with a buttload of things in the way.
 Of course the part is going to cost me $200 because I have the active brake control, labor is going to kill me. Thaks so much for your help- have a happy Easter.
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