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Coming along
Posted:
Sat Jun 10, 2017 5:43 pm
by shaun
Brakes rebuilt , and fitted for a dummy strut build
Re: Coming along
Posted:
Sun Jun 11, 2017 4:19 am
by RedS4
Beautiful!
What colour is that on the calipers? Who makes it?
Re: Coming along
Posted:
Sun Jun 11, 2017 7:18 am
by shaun
The calipers are zinc pasivated
Re: Coming along
Posted:
Sun Jun 11, 2017 9:29 am
by Certified Lotus
Nice work!
Re: Coming along
Posted:
Sun Jun 11, 2017 10:25 am
by RedS4
Did you do that yourself?
Re: Coming along
Posted:
Sun Jun 11, 2017 2:21 pm
by prezoom
Yellow zinc in just another option, like clear. There are kits that are available for the do it yourself person. I have used yellow on a bunch of items, like suspension components. Does not hide problems like paint or powder coating. It could be the plater I used, but I have some problems with the yellow turning dark and dull. It does not stand up to time as well as cad plating. The largest piece I ever had done was a live axle rear end housing. The nice thing is, it is easy to keep clean.
Re: Coming along
Posted:
Mon Jun 12, 2017 3:49 pm
by RichardHawkins
Shaun,
Who did the plating, and where are you?
I am also working on rear brake calipers at the moment, and am encountering so many problems and poor quality that I could cry. I have just noticed that the hand brake pads do not touch the discs uniformly and have traced this problem to the swinging levers (if that is the correct term) that are so poorly made that they do not touch the back of the handbrake pads evenly. I could file these levers to get even contact, but would then need to have them re-plated. Is this what you have done?
Richard Hawkins
Re: Coming along
Posted:
Wed Jun 14, 2017 4:19 pm
by knockoffnut
These yellow tinged coatings are usually a Di-Chromate Zinc conversion coating, which is a microscopically thin rust preventative layer deposited in a room temperature chemical bath. "Clear" (light gray) chromate zinc conversion coatings are also available, and you often see these on brake disks. Conversion coatings have a very limited life, and in weather or salt environments they quickly corrode away. Zinc electroplating or hot dip Zinc galvanizing each provide much more protection. Sometimes the surface of a Zinc Plating layer is converted with Chromate or Di-chromate to increase corrosion resistance, and increase the time before the zinc layer becomes powdery. Now days some restoration shops use a paint layer that is roughly the same colour as di-chromate to simulate the look and increase the longevity of the surface. You see this under the hood of many restored 1960's Mercedes now days, but to my eye it looks very odd.
Re: Coming along
Posted:
Tue Jun 20, 2017 8:23 pm
by patrics
Hi Shaun
Everything's looking good a part from the bolts. No offence but you can not use high tensile bolts that have been zinc passivated they suffer from hydrogen embrittlement - its a serious problem if stressed your caliper it could just fall in two.
That goes for any other passivated high tensile bolts you may have used on the suspension etc
Change the caliper bolts for 12.9 cap heads with the correct shank length.
Regards
Steve
Re: Coming along
Posted:
Wed Jun 21, 2017 9:26 am
by RichC
I don't see any retaining wire thru the bolts
Re: Coming along
Posted:
Wed Jun 21, 2017 10:30 am
by shaun
All bolts are only nipped up , fully tightened when assembled on chassis . Thanks for the info on the zinc plated bolts