Follow this guide if you need to replace the brake booster hose on your 1.8/2.0 TSI Seat Leon MK3.
Generic steps
-Remove engine cover
-Remove intake pipe
-Remove vacuum hose
-Disconnect pressure sensor
-Remove brake boost hose
-Optional: swap over brake pressure sensor
Reverse steps above
Partnr
5Q0612041AR
Why replace?
My Cupra was fitted with a cutout valve in the exhaust, which is operated by vacuum. Someone decided to tee-off from the brake booster hose, which is a big no-no in my opinion. If you would have a vacuum leak, then the brakes are compromised, which has severe safety implications. In the end, I ran a vacuum hose from the intake plenum (via the MAP sensor).
I replaced it with a 2nd hand unit, but decided to replace the pressure sensor, as I know the existing sensor was working fine.
Step-by-step video guide
Pictures
Generic steps
-Remove engine cover
-Remove intake pipe
-Remove vacuum hose
-Disconnect pressure sensor
-Remove brake boost hose
-Optional: swap over brake pressure sensor
Reverse steps above
Partnr
5Q0612041AR
Why replace?
My Cupra was fitted with a cutout valve in the exhaust, which is operated by vacuum. Someone decided to tee-off from the brake booster hose, which is a big no-no in my opinion. If you would have a vacuum leak, then the brakes are compromised, which has severe safety implications. In the end, I ran a vacuum hose from the intake plenum (via the MAP sensor).
I replaced it with a 2nd hand unit, but decided to replace the pressure sensor, as I know the existing sensor was working fine.
Step-by-step video guide
Pictures
Last edited:
