Hi, everyone!
I will post my rear disc conversion on 2001 puma. I am using focus rear hubs and ATE 253 mm discs. The reason? A challenge, and simply I would have needed to buy new shoes and have drums mashined/replaced anyway so I opted for rear disc conversion. I intend to keep the full usability of a car that means working ABS.
As you probably know, focus Mk1 uses different system with magnetic rings and different sensors. The only way of keeping functional ABS is to adapt the rear hubs to accomodate the existing sensors AND tone rings.
On Pumapeople there is a guide with a rough sketch that IS WRONG! I will stress it once again, the info there is WRONG (http://www.pumapeople.com/wiki/index.php?title=Possible_Ford_Brake_Upgrades" onclick="window.open(this.href);return false
It says that you need to mashine your hubs down to 65,6 mm and that is to much! I found it the hard way! I did it like it is stated BEFORE my newly purchased rings arrived (the old ones are on the car since I am using it) only to find out I over did it!
I bought MAPCO rings which are the only ones you can find on eBay and they are 66,2 mm diameter! So I needed to make up for lost material and had the hubs chrome plated to desired 66,3 mm to create an overlap of 0,1 mm
I stand to be corrected; maybe the original ford items are smaller in diameter and the info on puma people is OK, but if you are using MAPCO rings or http://www.ebay.co.uk/itm/ABS-SENSORRING-FORD-ESCORT-V-VI-VII-FIESTA-KA-ORION-PUMA-MAZDA-121-III-HINTEN-/160709965591?pt=DE_Autoteile&hash=item256b0f7717" onclick="window.open(this.href);return false; then you need to do it as it is pictured!
Next you need to mashine the rings. Their interior diameter is 44,1 mm and it is to small for focus hubs; they won't seat properly. You have to enlarge that opening to 48 mm.
A comparison shots of focus and puma tone rings together
The chroming process on one hub wasn't Ok and it ended in diameter of 66,2 mm. That is just about to big and the ring would move a bit. Since the original focus rings were glued in place, I opted to do the same here and used loctite 638 for the job (probably overdid it a bit with usage )
The hub carriers were cleaned and primed before I had them mashined
I used liquid metal to blank of the existing thread holes. The puma sensors are much bigger and need different mounting holes.
Now, I used some pasticine to establish the EXISTING gap between sensors and tone rings. On puma it is 0,6 mm. Used the same technique and measured the same gap for focus sensor and ring. The focus sensor is longer by 2 mm so I have to recess the seating for puma sensor by same amount and the gap would be as needed (hopefully )
After that, the usual job of renewal: painting everything before fitment…
Hubs were not primed before so had to prime them first
The carriers…
Two coats of matt black and one of clearcoat later…
And completed and ready for fitment!
What needed to be done: enlarging the hole for fitment and making a new one for the retaining screw
That is it for now! When I grab some time at my friends 2post electric jack the conversion will be completed and the theory behind my ABS functionality tested :shock:
I will post my rear disc conversion on 2001 puma. I am using focus rear hubs and ATE 253 mm discs. The reason? A challenge, and simply I would have needed to buy new shoes and have drums mashined/replaced anyway so I opted for rear disc conversion. I intend to keep the full usability of a car that means working ABS.
As you probably know, focus Mk1 uses different system with magnetic rings and different sensors. The only way of keeping functional ABS is to adapt the rear hubs to accomodate the existing sensors AND tone rings.
On Pumapeople there is a guide with a rough sketch that IS WRONG! I will stress it once again, the info there is WRONG (http://www.pumapeople.com/wiki/index.php?title=Possible_Ford_Brake_Upgrades" onclick="window.open(this.href);return false
It says that you need to mashine your hubs down to 65,6 mm and that is to much! I found it the hard way! I did it like it is stated BEFORE my newly purchased rings arrived (the old ones are on the car since I am using it) only to find out I over did it!
I bought MAPCO rings which are the only ones you can find on eBay and they are 66,2 mm diameter! So I needed to make up for lost material and had the hubs chrome plated to desired 66,3 mm to create an overlap of 0,1 mm
I stand to be corrected; maybe the original ford items are smaller in diameter and the info on puma people is OK, but if you are using MAPCO rings or http://www.ebay.co.uk/itm/ABS-SENSORRING-FORD-ESCORT-V-VI-VII-FIESTA-KA-ORION-PUMA-MAZDA-121-III-HINTEN-/160709965591?pt=DE_Autoteile&hash=item256b0f7717" onclick="window.open(this.href);return false; then you need to do it as it is pictured!
Next you need to mashine the rings. Their interior diameter is 44,1 mm and it is to small for focus hubs; they won't seat properly. You have to enlarge that opening to 48 mm.
A comparison shots of focus and puma tone rings together
The chroming process on one hub wasn't Ok and it ended in diameter of 66,2 mm. That is just about to big and the ring would move a bit. Since the original focus rings were glued in place, I opted to do the same here and used loctite 638 for the job (probably overdid it a bit with usage )
The hub carriers were cleaned and primed before I had them mashined
I used liquid metal to blank of the existing thread holes. The puma sensors are much bigger and need different mounting holes.
Now, I used some pasticine to establish the EXISTING gap between sensors and tone rings. On puma it is 0,6 mm. Used the same technique and measured the same gap for focus sensor and ring. The focus sensor is longer by 2 mm so I have to recess the seating for puma sensor by same amount and the gap would be as needed (hopefully )
After that, the usual job of renewal: painting everything before fitment…
Hubs were not primed before so had to prime them first
The carriers…
Two coats of matt black and one of clearcoat later…
And completed and ready for fitment!
What needed to be done: enlarging the hole for fitment and making a new one for the retaining screw
That is it for now! When I grab some time at my friends 2post electric jack the conversion will be completed and the theory behind my ABS functionality tested :shock: