Brake pedal hiss - Servo leak?

Forum for wheels, tyres, suspension, chassis, brakes
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JoeMc
Posts: 10
Joined: Fri Dec 07, 2018 11:03 am
Qashqai Model: Mk.1 Qashqai Facelift - J10b (2010–2013)

Post by JoeMc »

Hi has anyone ever encountered this? A hissing noise is coming from my brake pedal area. Is there a valve or something to the brake servo that could be leaking?
2010 1.5 dci N-tec

Ash68
Posts: 1
Joined: Thu Nov 26, 2020 10:33 pm
Qashqai Model: Mk.1 Qashqai Facelift - J10b (2010–2013)

Post by Ash68 »

Hi did you resolve this as my qashqai is doing the same but the hiss stops when the braks are pressed
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gloucester
Posts: 5173
Joined: Sun Apr 03, 2016 7:04 am
Location: Gloucestershire, England
Qashqai Model: Mk.2 Qashqai - J11 (2013–2017)

Post by gloucester »

Ash68 - welcome to this forum.

I don't know the answer I'm afraid.
(2015 Nissan Qashqai Tekna DIG-T 1.2 sold 15/6/18) ~ 2018 Suzuki Ignis SZ5 - 2018 Yamaha MT-07 ~ (2024 Volvo EX30 ordered)
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calnorth
Posts: 2719
Joined: Mon Feb 11, 2019 2:01 pm
Qashqai Model: Mk.2 Qashqai Facelift - J11b (2017–2021)

Post by calnorth »

Behind and above the brake pedal is where the brake Master Cylinder and Booster (Servo) system reside. Boost requires a vacuum developed by the engine. Noises like hiss or squelch likely arises around there. If vacuum is returning to atmospheric pressure you will have lost some or all brake power assistance. Power assisted braking that usefully reduces foot effort.

See if you can check your system by performing the Nissan diagnostic tests shown below. In any case get the brake system checked as vacuum hoses could be a problem as well.
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20-11-27 1.png

Mk2 Qashqai Facelift - J11b (2017–and onward)
1.6 Dig-T N-Connecta
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