brake disc replacement

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will do but at the end of the day brake disk bolts are just tight, not rusted and need good tools to undo them, then the disk needs to be pressed off of the hub, this can take light hammer blows to a full 6 tonne press, luck of the draw, Rick
 
had a proper go at the bolts on the caliper carriers loosened all but one on drivers side getting 1/2 inch drive long bar delivered tomorrow to go with the 19mm impact socket I used today thanks to all you guys and girls who posted the positive and helpful comments will let you know how it goes
 
not one I have come across, please tell me more, Rick

Same stuff used to etch copper, certainly it dissolves copper and has a definite reaction with rust.
It's cheap and readily available and may be worth trying. I am not sure, but I think "Naval Jelly" and the like are based on similar chemistry.
But, with things of this nature penetration is often the issue, ferric chloride at least has the merit of having a viscosity pretty close to water.

Edit: Ferric Chloride: FeCl3
 
don't know how true it is but was told by a bloke who rebuilds commercial gearboxes for a living that cillit bang is the new wonder relaease agent
 
don't know how true it is but was told by a bloke who rebuilds commercial gearboxes for a living that cillit bang is the new wonder relaease agent

Are you sure it wasn't this guy? :nenau
 

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don't know how true it is but was told by a bloke who rebuilds commercial gearboxes for a living that cillit bang is the new wonder relaease agent


I just looked up the formula for Cillit bang, some of the ingredients look promising. Removing rust, degreasing...:thumb2



This article was taken from the August issue of Wired magazine. Be the first to read Wired's articles in print before they're posted online, and get your hands on loads of additional content by subscribing online

Each month Wired’s chemist Dr John Emsley, author of nine books and 110 research papers, deconstructs an everyday product. This month: Cillit Bang cleaner.

> Aqua (water)

> Sulfamic acid

> Phosphoric acid

> C9-11 pareth-6

> Parfum

> Colorant

Sulfamic acid (chemical formula HSO2NH2)

Included in Cillit Bang because it’s good at cleaning metals and dissolving limescale. Sulfamic acid is used on a large scale by industry for these same reasons, but more importantly it is involved in manufacturing dyes and pharmaceuticals such as antibiotics and anti-cancer drugs. Sulfamic acid is also found in household products such as toilet cleaners.

Phosphoric acid (chemical formula H3PO4, food additive E338)

Phosphoric acid is found in fertilisers and water softeners, and is particularly useful at cleaning metals -- it is widely used as an industrial metal cleaner. This can be seen in some Cillit Bang ads, in which an old coin is rendered shiny.

It can also be bought as a DIY product, generally in the form of a gel, which can be used to remove rust. Phosphoric acid is generally regarded as one of the safest acids for use in regulating pH in manufactured items – so much so it’s even used in skin-care products

C9-11 Pareth-6

A powerful surfactant that’s safe enough to be used in skin-care products. This is the ingredient in Cillit Bang that removes grease and grime. C9-11 pareth-6 is even strong enough to remove the sticky traffic grime from cars and lorries.

Parfum

Although not specified, the major component appears to be limonene, which provides the citrus scent of lemons and oranges. It is present in the peels of these fruits and is extracted commercially from orange-peel zest.

Other uses for the chemicals mentioned

> Sulfamic acid is an ingredient in Steradent (falseteeth cleaner). But don’t use Cillit Bang to clean your teeth.


> Phosphoric acid is an ingredient in Coca-Cola and Pepsi.






So it could well work to release stubborn bolts.:clap
But don't smile when you are using it, especially if you have false teeth...:lol
 
Acetone is essentially nail polish remover............just don't let the Missus catch you :augie
 

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