Brake Wear: Change Pads, Driving Permitted Question
#1
Brake Wear: Change Pads, Driving Permitted Question
Tonight the above warning light appeared. 2020 Macan has 64,000 miles mostly highway.. does anyone have experience how many additional miles can the vehicle be safely driven before changing brake pads? TIA
Last edited by K MAN S; 06-16-2023 at 10:24 PM. Reason: Typo
#2
MB has a calculation for miles per pad mm but it relates to pad surface area, rotor diameter and force applied, so not directly applicable to Porsche. Having said that, a couple thousand miles should be no problem after the light turns on. I would replace the pads and sensor as soon as practicable.
Rotors are up to you. I replace grooved rotors but plan to re-use front rotors on the Cayenne because they are smooth and the pads are getting down to replacement thickness. Dealers usually recommend or insist on replacing rotors with pads. It is not strictly required.
Last edited by chassis; 06-17-2023 at 06:40 AM.
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wingless (06-17-2023)
#4
Welcome to the forum.
When the indicator lamp illuminates, then the warning contact sender wire must also be replaced. If the pads are replaced w/ greater than 2.5 mm of pad thickness then the undamaged wire may be reused. The pad replacement is required at 2 mm thickness.
WRT to the rotors the Factory Service Manual, FSM, defines many criteria for reuse versus replacement, not just thickness. It also defines limits on cracks, thickness variations and runout. The minimum rotor thickness is typically imprinted w/ cast text on the rotor and also defined in the FSM.
It is also very good maintenance to periodically properly flush the brake fluid w/ fresh. I like to do my vehicles every several years, but certainly at least follow the published service schedule.
My preference is usage of the windshield instead of the brakes, so mine typically last well over 100K miles. My wife's driving style was much more American, gas until stoplight braking and she'd get about 40K miles.
When the indicator lamp illuminates, then the warning contact sender wire must also be replaced. If the pads are replaced w/ greater than 2.5 mm of pad thickness then the undamaged wire may be reused. The pad replacement is required at 2 mm thickness.
WRT to the rotors the Factory Service Manual, FSM, defines many criteria for reuse versus replacement, not just thickness. It also defines limits on cracks, thickness variations and runout. The minimum rotor thickness is typically imprinted w/ cast text on the rotor and also defined in the FSM.
It is also very good maintenance to periodically properly flush the brake fluid w/ fresh. I like to do my vehicles every several years, but certainly at least follow the published service schedule.
My preference is usage of the windshield instead of the brakes, so mine typically last well over 100K miles. My wife's driving style was much more American, gas until stoplight braking and she'd get about 40K miles.
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chassis (06-17-2023)
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chassis (06-17-2023)
#6
This week in Germany my taxi driver was late and aggressive on the brakes in city driving. That has been my usual experience in nearly 30 years of traveling to Germany - hard brake application by taxi drivers. A co-worker (German guy) drives his 3er cab 3.0L TDI like he stole it, requiring liberal use of brakes.
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wingless (06-17-2023)
#7
Re: the American driving comment, what is your country of origin or reference point?
This week in Germany my taxi driver was late and aggressive on the brakes in city driving. That has been my usual experience in nearly 30 years of traveling to Germany - hard brake application by taxi drivers. A co-worker (German guy) drives his 3er cab 3.0L TDI like he stole it, requiring liberal use of brakes.
This week in Germany my taxi driver was late and aggressive on the brakes in city driving. That has been my usual experience in nearly 30 years of traveling to Germany - hard brake application by taxi drivers. A co-worker (German guy) drives his 3er cab 3.0L TDI like he stole it, requiring liberal use of brakes.
VERY limited driving experience in Europe, including Germany. REALLY wished I had a larger sedan on the Autobahn as the big MB and BMW vehicles passed my maxed out 3 series like I was standing still...
My experience is bad drivers have ZERO interest to learn / improve / change. It sucks that we have to share the road w/ those brain dead jerks.
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chassis (06-17-2023)
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wingless (06-25-2023)
#9
Brake light warning comes on with 2.5mm pad life remaining, approx.
MB has a calculation for miles per pad mm but it relates to pad surface area, rotor diameter and force applied, so not directly applicable to Porsche. Having said that, a couple thousand miles should be no problem after the light turns on. I would replace the pads and sensor as soon as practicable.
Rotors are up to you. I replace grooved rotors but plan to re-use front rotors on the Cayenne because they are smooth and the pads are getting down to replacement thickness. Dealers usually recommend or insist on replacing rotors with pads. It is not strictly required.
MB has a calculation for miles per pad mm but it relates to pad surface area, rotor diameter and force applied, so not directly applicable to Porsche. Having said that, a couple thousand miles should be no problem after the light turns on. I would replace the pads and sensor as soon as practicable.
Rotors are up to you. I replace grooved rotors but plan to re-use front rotors on the Cayenne because they are smooth and the pads are getting down to replacement thickness. Dealers usually recommend or insist on replacing rotors with pads. It is not strictly required.
#10
The pad sensor is a conductor within an over mold plastic insulator, retained by a metal spring clip.
That low cost part is snapped in-place during brake service and is easy enough to transfer between pads, assuming the plastic hasn't been worn away by the rotor.
That low cost part is snapped in-place during brake service and is easy enough to transfer between pads, assuming the plastic hasn't been worn away by the rotor.
#14
#15
My usage of the windshield gets me well over 100K miles on a set of pads.
My family members who are on the gas until braking at the red light get under 40K miles on the pads.
Also, high throttle in snowy conditions will cause the vehicle's stability control to wear the rear pads.