Do I need to declare to my insurance...

[bmw9818]

How many people when fitting disc brake trailing arms change the master cylinder or even understand why it should be changed ?
This = greater risk = higher premiums

recently posted up a thread in tech, was told mc is the same across all models as is servo,

whats the reason behind changing it? sudden increase in pressure on the mc which could lead to failure due to disc brakes instead of drums or....

[suedenim]

How many people when fitting disc brake trailing arms change the master cylinder or even understand why it should be changed ?
This = greater risk = higher premiums

recently posted up a thread in tech, was told mc is the same across all models as is servo,

whats the reason behind changing it? sudden increase in pressure on the mc which could lead to failure due to disc brakes instead of drums or....

As far as I'm aware drums require less assistance, so maybe the seals are only used to working to a certain pressure and perhaps shape themselves accordingly, adding a new pressure and a different stress weakens them?

Just guessing!

[bmw9818]

thats i thought as well, i planned to re-use the old 316i mc

[nickso]

a) why you're modifying it in the first place and they summise that you'll going to be driving it harder..

b) on the other hand you're adding valuable bits to your car, so you're less likely to want to ditch it.

c) the hike in premium is calculated to covering the cost of replacing said mods

All fine and well but unless you go for agreed value they won't pay out for the value of the mods anyway. I can accept they will assume you will drive the car in a more spirited manner, and rightly so.

[pacerpete]

Master cylinders are the same regardless of brakes

Only on later cars. Early pov spec chrome turds have different master cylinders to all disc cars. Different cylinder bore and part numbers.


Maybe master cylinders were not the ideal example but my point being that lots of Freds in sheds are nailing bits on their cars without any background knowledge of how things work .

[snakebrain]

lots of Freds in sheds are nailing bits on their cars

There was an E36 on ebay a while back with a bodykit made entirely of MDF.

[suedenim]

Master cylinders are the same regardless of brakes

Only on later cars. Early pov spec chrome turds have different master cylinders to all disc cars. Different cylinder bore and part numbers.


Maybe master cylinders were not the ideal example but my point being that lots of Freds in sheds are nailing bits on their cars without any background knowledge of how things work .

This is for a facelift late model; poverty spec refering to the steelies, black bumpers, analogue clock, keep fit sunroof, radio blank, etc. One less thing to worry about!

[DanThe]

Master cylinders are the same regardless of brakes

Only on later cars. Early pov spec chrome turds have different master cylinders to all disc cars. Different cylinder bore and part numbers.


Maybe master cylinders were not the ideal example but my point being that lots of Freds in sheds are nailing bits on their cars without any background knowledge of how things work .

The early servos were also different, pre-pre-facelift that is, the pre 87 cars IIRC had a different MC/split system arrangement also but ive seen it on both drum and disc, even sports had it.
But yeah I completely agree with what you are saying, ive put plenty of lash ups right myself, even ones done by so called 'specialists' that have cost several thousand pounds more than a proper job would round here

[bmw9818]

^ so just to confirm, 51mm struts and rear discs off a 86 325i, will be okay in a 90 1.6? all pipes etc are similar, or do i need to mod,

[DanThe]

It will bolt in and work

[suedenim]

^ so just to confirm, 51mm struts and rear discs off a 86 325i, will be okay in a 90 1.6? all pipes etc are similar, or do i need to mod,

Are you going to be fitting a rear ARB too?

[fuzzy]

very few would bother .

indeed..

Would you?

no. not for upgrading the brakes to others available within the range.

[bmw9818]

^ so just to confirm, 51mm struts and rear discs off a 86 325i, will be okay in a 90 1.6? all pipes etc are similar, or do i need to mod,

Are you going to be fitting a rear ARB too?

yep new subframe and arm bushes, along with a lick of paint, an LSD and H&R arbs,

[magpie]

^ so just to confirm, 51mm struts and rear discs off a 86 325i, will be okay in a 90 1.6? all pipes etc are similar, or do i need to mod,

Are you going to be fitting a rear ARB too?

you will need the hand brake cables for the disc set up.

[bmw9818]

^ so just to confirm, 51mm struts and rear discs off a 86 325i, will be okay in a 90 1.6? all pipes etc are similar, or do i need to mod,

Are you going to be fitting a rear ARB too?

you will need the hand brake cables for the disc set up.

i should be okay the donor cars had the subframe off in the past according to service history, fitted polybushes, and that in around 2010 so hopefully i can re-use the cables,

[suedenim]

I think cables are different for drums and discs.

[bmw9818]

yeah i know, got two cars one drums one wit discs disc one is the donor

[Andyboy]

ive put plenty of lash ups right myself, even ones done by so called 'specialists' that have cost several thousand pounds more than a proper job would round here

"Aaaarrrrrrrrrrrrrr, avast there me hearties, we'll 'aaave a flaggon of cider down the Jolly Parrot and then set to work bodging up an E21".


"A maaaasterly plan you fella-me-lad" etc etc.

[HairyScreech]

I must take offense to that you northern ferret felcher, that be pirate speak not zummersetttttt lingo.