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Been slowly upgading my A6 2.5 TDI. Got fed up with the useless standard brake set up ( solid front discs on a 1400 kg car FFS!!!!!!)
Bought a complete HP2 set up from the S6 Spink was breaking. The calipers were rusty to say the least but in good condition.
I used to clean the parts on my mk1 gti the same way using electrolysis.
Parts needed-
PLASTIC tub/bucket/washing up bowl- I use a stackable plastic storage box.
Battery.
Battery charger.
old brake disc.
jump leads.
Soda Crystals.
Water.
caliper at start
Depending on the item being derusted, fill the container with enough water to cover the item then add the soda crystals (i use a ratio of 62.5g/ litre )
Because the system works by line of sight i used two rusty old brake discs either side of the caliper.
With the charger connected to the battery the + side connected to the disc (anode) and the - side to the item to be derusted (cathode)
As soon as you connect the terminals up the process will begin and you with see the bubbles start.
I left the caliper in for 5 hours total, checking every hour.
The picture of the derusted caliper is after it has been washed clean of the solution.
The rust flakes left on it can be removed with a fingernail and final cleaning will be done with a wire brush tomorrow!!
Comparison of before and after
Having done this with calipers before the process does not damage the piston and slider rubbers, all i did was block the flexi hose so not solution could get inside.
Bought a complete HP2 set up from the S6 Spink was breaking. The calipers were rusty to say the least but in good condition.
I used to clean the parts on my mk1 gti the same way using electrolysis.
Parts needed-
PLASTIC tub/bucket/washing up bowl- I use a stackable plastic storage box.
Battery.
Battery charger.
old brake disc.
jump leads.
Soda Crystals.
Water.
caliper at start
Depending on the item being derusted, fill the container with enough water to cover the item then add the soda crystals (i use a ratio of 62.5g/ litre )
Because the system works by line of sight i used two rusty old brake discs either side of the caliper.
With the charger connected to the battery the + side connected to the disc (anode) and the - side to the item to be derusted (cathode)
As soon as you connect the terminals up the process will begin and you with see the bubbles start.
I left the caliper in for 5 hours total, checking every hour.
The picture of the derusted caliper is after it has been washed clean of the solution.
The rust flakes left on it can be removed with a fingernail and final cleaning will be done with a wire brush tomorrow!!
Comparison of before and after
Having done this with calipers before the process does not damage the piston and slider rubbers, all i did was block the flexi hose so not solution could get inside.
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