Brakes feel soft or smell hot on the hill?
Pull over somewhere safe, away from the traffic, switch off and let them cool. Don't carry on down on brakes that feel wrong. If you're a roadside assistance member, ring them from a safe spot; if anyone is hurt or in danger, call 000.
Mundaring's roads and hills
Greenmount Hill
Between Mundaring and the coastal plain, the highway drops down Greenmount Hill: a steep 3 km at a 7% gradient. Trucks are told to use low gear and held to 40 km/h, and there's an arrester bed at the bottom for any that can't stop.
Through the hills at 80
From Greenmount to Sawyers Valley, three and a half kilometres past Mundaring, the limit is 80 km/h. Past The Lakes, on Perth's eastern fringe, it drops to one lane each way for the long run to Kalgoorlie.
Parks on every side
The Shire of Mundaring covers 645 square kilometres and holds three national parks, Beelu, Greenmount and John Forrest, plus the Bibbulmun Track and Munda Biddi Trail. East of town the highway cuts through a corner of Beelu National Park.
A hills town
Mundaring's name comes from Mindah-lung, said to mean a high place on a high place. About 3,190 people lived here in 2021.
The licence
In WA every business in the motor repair and servicing industry must have a repair business licence, and the repairers hold a repairer's certificate. Consumer Protection WA says to run an online licence check.
What the hill asks of a car
Going down, the brakes do the work, and a long descent can heat them until they fade. A lower gear lets the engine hold the car back, which is the same thing the truck signs are asking of heavy vehicles. Coming back up on a hot day, the engine and an automatic gearbox are under load, so the cooling system has to be in good order.
Brakes explains the warning signs, and radiators and cooling in Perth covers what the mechanic checks before summer.
If we lived up the hill
We'd have the brake pads, discs and fluid checked at every service, not every second one, and the cooling system looked at before summer. Going down Greenmount, we'd drop a gear early and let the engine do some of the braking.
