MA60
Member Since: 17 Feb 2018
Location: South Wales
Posts: 41
  
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| EPB / PBM operation logic |
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Hi
Been reading the D4 workshop manual  to understand the functioning of EPB and the PBM while the vehicle is stationary
I get that when the EPB is selected ON, the PBM motor drives the Spline Shaft until the Force Sensor detects sufficient tension in the brake cables, and then stops the motor
(and I guess that if an abnormally high current or abnormally long motoring time is detected before sufficient tension is reached, the PBM throws a fault)
But I can't find any explanation about PBM action when the EPB is selected OFF:
How does the PBM decide when to stop the motor? Is it:
* tension in brake cables (from Force Sensor) drops to a certain level?
* motor runs for set time?
* motor runs for set number of turns?
* something else?
and similarly, how does PBM decide if there is a fault when EPB is selected OFF? e.g. Tension in brake cables doesn't reduce after set time? Abnormally high current? Something else?
Alan 1961 Series II 88" petrol - Bronze Green - gone
1984 V8 Ninety CSW - Trident Green - gone, but not forgotten
1995 Disco 1 Tdi - Niagara Grey - gone
2002 Disco 2 Td5 ES7 - Bonatti Grey - gone- after 247000 miles
2011 Disco 4 SDV6 HSE - Zermatt Silver. RLD wheel protector. LED interior & reversing bulbs. GAP IID BT. Altox. Bovee 1000
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 30th May 2024 5:15 pm |
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